Orion STARSHOOT G3 User's Manual
Contents
1. Connecting the Camera to the PC After the software and drivers have been installed connect the camera to the USB port on your computer using the supplied USB cable You do not need to plug in external power yet Windows will automatically detect the camera and install it onto your com puter Wait for the message to appear Device Installed Successfully 3 Software Walk through Camera Studio is an easy to use yet comprehensive imaging program that controls your G3 for image capture and provides the processing tools to assemble your image and export it The following section of the manual will walk you through the basic features of the software Camera Control Capture Calibrate Process and Save amp Export 3 1 Camera Control Figure 5 The Camera Control tab first appears on the right hand side of the screen when you open Camera Studio This tab allows you to connect to the camera activate the cooler and set the cooling temperature adjust the gain and offset not rec ommended or enable faster readout for quick image downloads Connect Disconnect Connects the G3 and instantly dis plays the CCD temperature The G3 camera must be plugged into your PC before you click Connect Cooling The CCD Temperature will always display while the camera is connected To use the TEC plug the 12V power cable from your power source field battery or other to the G3 camera The fan will automatically power on Click Cooler2. filter threads M28x0 6 T threads M42x0 75 USB cable Dust cap 1 25 nosepiece removeable StarShoot G3 Deep Space Imaging Camera Software CD 4 5 Computer The G3 requires a PC to operate the camera For astro imaging in the field at night a laptop computer is highly recommended The included software is Camera Studio which requires Windows XP Vista or Windows 7 to operate The following hardware is also required Processor 700 MHz speed or higher Pentium III equivalent or higher Recommended minimum memory size is 512 MB Disk Space 55 MB for software installation 500 GB or more to store images is recommended Video Display 800 X 600 or higher 16 bit color or higher Mouse High speed USB 2 0 port Power The StarShoot G3 s thermoelectric cooler TEC requires 12 volts DC 12VDC with approximately 1 ampere of current The camera itself can operate without the cooler just by connecting to the computer s USB port For the best imaging performance we recommend using the TEC The supplied 12V power cable will plug into a cigarette style socket commonly available on power supplies or field batteries available from Orion If you have access to an AC outlet at your imag ing site you can use a 110VAC to 12VDC adapter for the camera available from Orion 2 3 Software and Driver Installation Before the camera can be used the software and camer
3. On Set the Target C to approximately 7 C lower than the current CCD temperature reading Do not click Cooler On until external power has been plugged into the G3 Gain This feature allows you to manually adjust the analog gain and offset The default values have been selected for your camera and should normally not need adjustment However you may make adjustments to customize your settings Default values are Offset 127 and Gain 185 3 2 Capture Figure 6 The Capture tab sets your exposure time exposure type save path subframing and other options Exposure Set the exposure time in seconds You can also specify fractions of seconds like 0 5 seconds or 1 75 seconds for example Type Choose from Light Dark Flat and Bias Most of the time you will only need to choose from Light and Dark frames but for the best results you can also take Flat frames See Astronomical Imaging Dark Frames Flat Fields To start imaging or focusing take Light frames Bin You can bin 1x1 1x2 2x1 and 2x2 For most imaging you should always keep the setting at 1x1 which provides the full resolution of the camera Binning 1x2 or 2x2 for example will group the pixels together to collect more light at the expense of resolution 1x2 will group 2 vertical pixels for every 1 horizontal pixel 2x2 will group 2 horizontal and 2 vertical pixels and is most commonly used to quickly find and frame a celestial object Binning in thes
4. a star Figure 10 to determine the best focus The smaller the HFD the better the focus Figure 11 Create a subframe around the star you want to focus on Figure 10 The Analysis window displays useful data about your image Hovering the mouse over a star will also display the HFD value which indicates the star diameter for best focus 12 13 CCD temperature will naturally heat up on its own To start with set the Target C to about 7 C lower than the current CCD Temperature to allow yourself some margin for outdoor temperature changes Figure 12 5 Let the camera temperature stabilize You can resume imaging while this takes place It s common for the CCD temperature to fluctuate to within about 1 C of your target temperature You can view the Temperature Log Figure 13 to monitor the status of the cooling system Go to the Camera menu and click Temperature Log If the cooler power remains at 100 after 20 minutes you need to reduce the target temperature Most of the time you can simply monitor the CCD temperature by looking at the CCD Temperature in the Camera Control tab Note Being able to match the light and dark frame temperature is more important than trying to cool the CCD more than the TEC will allow Matching the dark frame temperature to your light frames ensures a very effective calibration to remove unwanted noise from your images Additionally you will notice the CCD temperature wil
5. receiver in connected Consult the dealer or an experienced radio TV technician for help A shielded cable must be used when connecting a peripheral to the serial ports
6. speed IR cut filter No Optical window Fully coated with anti reflection coatings Backfocus 3 5mm via 2 attachment 23mm via 1 25 nosepiece attachment 19mm via T thread attachment IR block No Weight 12 oz Autoguider capability Yes Mounting 1 25 nosepiece 2 nosepiece or T thread One Year limited Warranty This Orion StarShoot G3 Deep Space Imaging Camera is warranted against defects in mate rials or workmanship for a period of one year from the date of purchase This warranty is for the benefit of the original retail purchaser only During this warranty period Orion Telescopes amp Binoculars will repair or replace at Orion s option any warranted instrument that proves to be defective provided it is returned postage paid to Orion Warranty Repair 89 Hangar Way Watsonville CA 95076 If the product is not registered proof of purchase such as a copy of the original invoice is required This warranty does not apply if in Orion s judgment the instrument has been abused mishandled or modified nor does it apply to normal wear and tear This warranty gives you specific legal rights and you may also have other rights which vary from state to state For further warranty service information contact Customer Service Department Orion Telescopes amp Binoculars 89 Hangar Way Watsonville CA 95076 800 676 1343 Oriontelescopes com 89 Hangar Way Watsonville CA 95076 Customer Support Help line
7. 800 676 1343 2011 Orion Telescopes amp Binoculars This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Changes of modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment Note This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio fre quency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equip ment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an output on a circuit different from that to which the
8. Histogram window displays how the bright and dark pixels are distributed in your image You can make all the adjustments to the Histrogram you want to reveal the details within the image and it will not affect the image data only the way it is displayed Choose the presets like Medium or drag the light and dark markers manually to adjust the image on your screen Your computer monitor only displays 8 bits of depth from black to white whereas your StarShoot G3 camera takes images with 16 bits of depth That s the difference between 255 counts and 65 535 counts So you need to check the Histogram to see how much image detail you really have Subframe You can selectively download a segment of the whole field of view to provide extremely fast download times This is useful for focusing since you typically just concentrate on one star Click and drag the mouse across part of the image to form a square Figure 7 then check the Subframe box The subframe size and coordinates will also be displayed in the Subframe dialog Note Make sure the Subframe box is unchecked when you start capturing your astrophotos or you could unin tentionally subframe your images into a small square Capture Single Takes a single exposure only The exposure length will be determined by the Exposure value in seconds you entered Capture Loop Continuously takes exposures until you press Stop The Stop button will only appear a single or loopi
9. Orion StarShoot G3 Deep Space Imaging Cameras Color 53082 Monochrome 53083 InStruCtIOn Manual Providing Exceptional Consumer Optical Products Since 1975 Oriontelescopes com Customer Support 800 676 1343 E mail support telescope com Corporate Offices 831 763 7000 89 Hangar Way Watsonville CA 95076 2011 Orion Telescopes amp Binoculars IN 400 Rev A 09 11 2 3 1 Introduction Welcome to the exciting world of astro imaging Your new StarShoot G3 Deep Space Imaging camera is capable of capturing impressive celestial objects like galaxies star clus ters and nebulae as well as the planets Moon and the Sun with an optional solar filter Additionally the StarShoot G3 can be used as a dedicated autogudier for any other astro imaging camera you might use like a DSLR camera or large array CCD camera This man ual will show you how to install and use your new StarShoot G3 In a short time you will be capturing astrophotos and sharing them with friends fam ily and the world 1 1 the StarShoot G3 The StarShoot G3 is an astronomical imaging CCD camera with a 16 bit image output and a regulated thermoelectric cooler to enable maximum imaging perfor mance Both the G3 Color and G3 Monochrome are very sensitive and capable of detecting faint deep sky objects in a short exposure and longer exposures can reveal extremely deep fields with subtle nebulosity and galaxies in the background You may also
10. a drivers must be installed onto your computer Turn on your computer and allow the Windows operating system to load as normal Insert the included software CD into your computer s CD ROM drive and the Orion G3 Setup Wizard will appear Figure 4 1 This allows you to install the camera drivers Camera Studio software ASCOM drivers and any additional prerequisites you may need The wizard will automatically detect which prerequisites you need and prompt you to install them Figure 4 2 2 Getting Started 2 1 Parts List Figure 1 StarShoot G3 Deep Space Imaging Camera USB Cable DC power cable with lighter plug Software CD Removable 1 25 nosepiece threaded to camera Dust cap for 1 25 nosepiece 2 2 System requirements Telescope The StarShoot G3 fits any telescope equipped with 1 25 or 2 focusers or it can also fit to any focuser or camera adapter with male T threads M42 x 0 75 Refer to Figures 2 1 and 2 2 Caution Be sure to always firmly tighten the thumbscrew s that secure the StarShoot G3 in the telescope focuser or it could fall out and onto the ground If your telescope has T threads for direct camera attachment a more secure connection can be made First unthread the nosepiece from the G3 This exposes the camera s T threads Then simply thread the camera onto your tele scope Figure 2 2 Backfocus Requirement The G3 only requires 3 5mm of inward focus trav
11. choose to use the G3 as a dedicated autoguider The highly sensi tive low noise 16 bit camera allows faint guide stars to be detected The on board autoguiding output allows you to connect the autoguide cable directly from the camera to your ST 4 compatible mount 1 2 Feature Highlights Simple interface A USB port is all that s needed to connect the G3 to your computer Figure 3 The power port is used to power the thermoelectric cooler which is recommended for the best imaging performance Regulated cooling Enables you to set the exact temperature within the cooling range of the camera This allows you to take calibration images like dark frames at the exact same temperature as your light frames making for the cleanest images possible Additionally since you can match the CCD temperature at any time within the range of the cooler you have the freedom to take dark frames when it s most convenient for you so you don t have to use up valuable imaging time to take dark frames Vibration free MagLev Cooling Fan This essential component of the cooling system vents out the head generated by the TEC Autoguider output Figure 3 When used as an autoguider the G3 can connect the autoguider relays directly from the camera body to your equatorial mount This eliminates the need to relay an additional adapter from your PC Figure 1 StarShoot G3 Imaging Camera and included items Figure 2 1 The G3 can be conn
12. e modes provides faster download times and greater sensitivity Figure 5 Camera Control window Figure 6 Capture window Figure 4 3 8 9 Capture Color Raw YCbCr RGB for StarShoot G3 Color only These modes determine what kind of images will be captured If you are using the StarShoot G3 Color we recommend always capturing in Raw to allow for image calibration later See Image Processing Calibrate Raws The image will appear black and white at first but can later be converted to color But for quick imaging to instantly get color you can select YCbCr the most natural color from the camera or software processed RGB Note The StarShoot G3 Monochrome will have this feature disabled since the images can only be captured in monochrome Capture Auto dark If you save a dark frame you can optionally check the Auto dark box to automatically calibrate the saved dark frame each time you capture an image While this can be convenient we recommend keeping this feature off under normal use since enabling it permanently affects the raw data you capture Capture New buffer Check this box to display a new window each time a new image is captured This is useful to compare or keep the image open without saving it Keep in mind that more images will consume more system memory The New buffer box should be left unchecked during multiple looping exposures or long sequences 3 3 Histogram Figure 9 The
13. ected to your telescope in three different ways 1 25 2 or T thread Contents 1 Introduction 2 1 1 The StarShoot G3 3 1 2 Feature Highlights 3 2 Getting Started 4 2 1 Parts List 4 2 2 System Requirements 4 2 3 Software and Driver Installation 5 3 Software Walk Through 6 3 1 Camera Control 6 3 2 Capture 7 3 3 Histogram 9 3 4 Analysis 10 4 Astronomical Imaging 11 4 1 Focusing 11 4 2 Using the Thermoelectric Cooler TEC 12 4 3 Imaging Deep Sky Objects 14 5 Image Processing 17 5 1 Save and Export 19 6 Using the StarShoot G3 as an Autoguider 20 7 Optional Accessories 21 8 Specifications 22 Figure 2 2 Standard 1 25 filter threads add versatility to allow additional accessories to be used DC power cable with lighter plug 2 Mounting base 1 25 Nosepiece T threads Standard 1 25
14. ee Dark Frames in Section 4 3 at the same temperature as your light frames which will remove most of the nose effectively The StarShoot G3 can cool the CCD to about 10 C below the ambient temperature But remember that the ambient temperature changes and you want to have enough cooling capacity to take dark frames at the same temperature later To set the cooler 1 With the G3 already connected to your computer plug the 12V power source into the G3 s power port The fan will immediately power on 2 Click Connect in the Camera Control tab if you have not already done so 3 Click Cooler On and the CCD temperature will begin to drop 4 Enter a target temperature for the CCD in Target C and remember you can only cool to about 10 C cooler than the outside air temperature The Figure 12 Monitor the CCD temperature and determine the best target temperature to set Figure 13 The temperature log can help you determine how much margin you have to cool the camera based on the cooler power and current CCD temperature 14 15 Naming conventions are most important for StarShoot G3 Monochrome users who may be using LRGB or narrowband filters Change your file name to indicate what filter you are imaging through For example Dummbell_Luminance or Dummbell_ Red etc Dark Frames Dark frames are images taken with no light coming into the camera A dark frame is typically taken with the telescope s objec
15. el also sometimes called backfocus when connecting it to a 2 focuser on your telescope If using the 1 25 nosepiece the backfocus is 23mm if connected via T threads the backfocus is 19mm Mount Deep sky imaging with the G3 requires an equatorial mount with a right ascension R A motor drive The goal for your mount is to seamlessly track the apparent movement of the sky as the Earth rotates The tracking must be very accurate or the object you want to image will drift and blur across the camera s field of view while the exposure is taken Even a small amount of drift will cause a star to look oblong instead of a round point We recommend using a high quality equatorial mount which utilizes periodic error correction PEC or has the ability to interface with an autoguider Figure 3 The USB power and autoguider ports Figure 4 1 Figure 4 2 Cooling fan USB port Power port for TEC and fan only Autoguider relay port 6 7 Once your prerequisites have been installed you will be prompted to install the G3 ASCOM driver and Camera Studio software Figure 4 3 Note that ASCOM is only required if you intend to use the camera in another program such as Nebulosity and MaxIm DL or if you wish to use the camera as an autoguider Click Orion Camera Studio Application to install the software Do no plug the StarShoot G3 camera into your computer until you have com pleted the software and driver instal lation
16. es will be raw 4 In the Capture tab set the Exposure value to around 10 20 seconds and click Start After the image downloads check to see if the deep sky object is centered well in your camera Adjust the camera orientation if needed keeping in mind that you may have to refocus the camera after making the adjustment Reposition the telescope if needed to center the deep sky object 5 Click Sequence and set the Directory save path and File Name for your images as well as your exposure details Figure 8 For most deep sky imaging set Run Always check on Type Light 1x1 Exposure Greater than 30 seconds to your choosing Binning 1x1 Repeat multiple exposures we recommend more than 5 6 Click the Run Sequence and the G3 will immediately begin the sequence of exposures A naming convention is assigned to your File Name If you called your image Dumbbell and you are capturing 10 images the sequence will save them in your specified directory as Dumbbell1L1 fit Dumbbell2L1 fit Dumbbell3L1 fit and so on Figure 14 A dark frame contains the thermal and background noise as well as any read noise The same noise appears in your light images Dark frames isolate the noise so it can later be subtracted from your light images 16 17 imager you may choose to skip this step for the time being Vignetting Vignetting Figure 15 1 in a telescope reveals edge darkening in the astroimage The sensiti
17. gure 16 The Combine Images window allows StarShoot G3 Monochrome users to calibrate align all in a streamlined task Figure 17 The Calibration window lets you select your darks and flats if applicable Bias frames are not typically needed if you have dark frames Figure 15 1 Larger format CCD cameras like the Parsec reveal vignetting through most telescopes Vignetting occurs when the edge of the image plane has less illumination than the center Figure 15 2 Dust or other particles on the camera s optical window can show up as distracting dark shapes in your images 18 19 Convert to Color For the StarShoot G3 Color only 1 With your calibrated images still open goto the Process menu and select Color then CMYG Raw conversion We recommend using the default values Figure 18 but you may adjust them to your liking 2 Click apply to complete the color conversion Align 1 With your images still open goto the Process menu and select Align The Align Images window will appear 2 Select Auto Star matching and click Align The images should automatically align If they do not appear to align correctly when they are combined later you can manually align the images by selecting Translation Manual and select a star in each image to align to by clicking Start Manual Star Pick Figure 19 Combine 1 With your images still open goto the Process menu and select Combine The Combine Images w
18. have completed and saved your astro image and wish to export it in a common JPEG or TIFF file format choose Export from the File menu The Export window will appear Figure 21 JPEG Choose JPEG if you want a smaller file size JPEGs are saved in 8 bits of depth only so you should specify the histogram stretch you want Choosing No Stretch in JPEG will not work properly since you will be throwing away most of the dynamic range of the image Instead adjust the histogram until the image looks to your liking then choose Use current histogram stretch This will save the JPEG image to look exactly as it does no your screen TIFF TIFFs are saved in 16 bits and are a good choice to export your image to Photoshop for additional image editing Figure 20 Select the open images to align Figure 21 Choose your file format and export settings to export your image as a TIFF or JPEG Figure 19 Manual Star Pick can be used if you have difficulty aligning your images with the automatic methods Figure 18 For G3 Color users Convert CMYG Raw is the best way to convert raw images to color 20 21 When you have made your selection for Export click Export and specify the file name and folder destination then click Save 6 using the StarShoot G3 as an autoguider The StarShoot G3 also functions as a very high performance autoguider Use the included ASCOM drivers for the camera to operate it in any number of ASCOM compa
19. he most critical parts of imaging It can be challenging but Camera Studio has some helpful features which will assist you when focusing your G3 Before focusing make sure your mount is polar aligned and tracking For best results we recommend focusing on a star at least 30 above the horizon or higher Follow these steps to achieve an accurate focus 1 Find and center a moderately bright star through your finder scope Try to find a star around magnitude 4 or 5 If you are not using an optical finder or just using your unaided eye the star should look relatively faint This is important because brighter stars will easily over saturate the camera and compromise the focus accuracy 2 Center your telescope on the star using an eyepiece Make sure the right ascension R A tracking motor is engaged on your mount 3 Replace the eyepiece with the G3 4 Connect the G3 to your computer and open Camera Studio In the Camera Control tab click Connect 5 Go to the Capture tab set the Exposure to 1 second and click Single You should see the out of focus star in the image If you do not see anything you need to increase the exposure time 6 Draw a small box around the unfocused star with your mouse hold click and drag the mouse cursor around the star to draw the box Figure 11 Check the Subframe box 7 In the Capture tab click Loop The camera will only download the area you previously selected which makes each image d
20. ily identify your flats later 4 Set the Exposure value to 0 1 seconds for now and click Start or Run Sequence Looking at the Global section of the Analysis window you want the Maximum to read somewhere around 10 000 15 000 Adjust the exposure time as needed until the Maximum is close to this range It s a good idea to take several flat frames and try different exposure times until you find the correct exposure If you are taking your flats near dusk or dawn the sky brightness will change rapidly 5 Image Processing After you have captured your astro images with or without dark frames you will need to 1 Calibrate Raws 2 Convert to Color only applicable to StarShoot G3 Color 3 Align 4 Combine If you are using the StarShoot G3 Monochrome all of these steps can be performed in the Combine Images window Figure 16 For StarShoot G3 Color users the calibration and color conversion should be done separately before proceeding to align and stack Calibrate Raws 1 Open your saved astro images They should be saved as Raw to enable the following steps Do not convert your raws to color yet 2 Go to the Process menu and select Calibrate The Calibration window will appear Figure 17 3 Click Add Files and select your saved dark frames and flat fields if applicable 4 Click Calibrate all files and you will notice most of the hot pixels and noise should disappear from your images Fi
21. indow will appear Figure 16 2 Since you have already calibrated and aligned your images proceed to the Stack tab Remember that if you are using the StarShoot G3 Monochrome you can perform all of these tasks in each of the tabs of the Combine Images window 3 Select Add Images then Select All then Apply Figure 20 4 Proceed to the Stack tab Keep the default settings We recommend Sigma Reject which is effective at removing unwanted leftover hot pixels satellite trails or other unwanted artifacts from your image 5 Click Combine and your resultant image will appear If the image did not appear to combine correctly go back to the Align tab and try to use a different alignment method Normally the Auto Star matching is the easiest method 5 1 Save and Export Always save your work in the native FIT format which will preserve all of the image data you worked on FIT is a common file format for CCD imaging and is understood by many other image editing programs including plugins that are available for Adobe Photoshop You may choose to edit your image further Camera Studio has several other image enhancement features such as sharpening low pass filters Gaussian blur filters as well as color balance adjustments to enhance your image Explore these features in the Process menu But always save your original FIT file Choose Save As in the File menu to save different versions of your edited work If you
22. ken with uniform featureless light entering the telescope such as a blue sky in the early morning or after sunset Flat fields solve a number of issues in your astro images However for the beginner astro 4 3 Imaging Deep Sky Objects Capturing impressive images of deep sky objects such as galaxies nebulae and star clusters require relatively long exposures You will take several individual images and stack them together to form one high quality resultant image Very accurate polar alignment is essential for deep sky imaging Stars will streak across the field of view without precise polar alignment and tracking Longer exposures of 60 seconds or more also require autoguiding with a separate camera The Orion StarShoot AutoGuider available separately from Orion can be operated with the G3 in PHD Guiding To start 1 Acquire and center the deep sky object into the field of view of your eyepiece If you are using a mount with an accurate computerized go to system you can keep the camera installed in your telescope s focuser without using the eyepiece 2 Remove the eyepiece and replace it with the G3 camera 3 Focus the camera as outlined in Section 4 1 If necessary move the telescope to a nearby star to determine the best focus For best results we recommend selecting Raw in the pull down menu next to the Color label in the Capture tab Figure 6 For StarShoot G3 Monochrome users no special selection is needed all imag
23. l rise if multiple fast expo sures are taken in succession This is normal and the temperature will drop back to your target temperature shortly than the whole frame The exposures will display continuously Adjust the focuser as needed to get the sharpest looking star 8 Once the star looks sharp hover the mouse cursor over the star and pay attention to the HFD value Make additional adjustments to the focuser if needed to achieve the smallest HFD possible Be sure to uncheck the Subframe box once you are done focusing Note If the G3 is grossly out of focus no object will appear in the image not even a blur Increase the exposure time if needed and patiently move through the focus range of your telescope until you see the centered star come into view 4 2 using the thermoelectric Cooler tEC The StarShoot G3 s cooling system was designed to reduce the noise in your astro images All digital cameras whether CCD or CMOS have inherent noise Taking longer exposures at night on a target that is very faint will have little signal so the noise will be more apparent Cooling the CCD camera suppresses the most prominent noise the thermal noise You will see bright pixels in most of the images you capture These bright pixels and a lot of the noise you see will be reduced by activating the thermoelectric cooler TEC Just as importantly the noise stays fairly consistent at the same temperature You should take your dark frames s
24. ng exposure The Loop is useful for focusing when you are at the telescope and wish to monitor the focusing progress on your monitor Capture Sequence Automatically capture and save images This is a very convenient feature It allows you to save your images while you sleep or do other tasks In the Sequence window Figure 8 you can set your destination Directory to save your images to as well as specify the same parameters you would in the Capture tab like Exposure Type and Bin In the Sequence window you can also specify Repeat to set the total number of exposures you want to automatically capture Click Run Sequence when you are ready to begin Figure 8 The Sequence dialog allows you to set your exposure then automatically image while you are away from the computer Figure 9 The sliders on the Histogram can be adjusted to reveal lighter or darker depths of the image Figure 7 Subframing a small area speeds up the download time and allows you to concentrate on one area of the chip ideal for focusing 10 11 The following sections will describe more software features which you will encounter during your imaging session and later on when you are ready to process your images 4 astronomical Imaging Now that you have familiarized yourself with the basic functions of the camera and software you are ready to begin using the StarShoot G3 to capture images 4 1 Focusing Focusing the CCD camera is one of t
25. ownload significantly faster 3 4 analysis Figure 10 The Analysis window displays quantitative data from the image pertaining to pixel brightness and star diameter Your mouse cursor position will focus on that region of the image for the Analysis display Figure 10 The information displayed is very useful but for beginning astro imagers concentrate mainly on getting the smallest HFD possible when focusing on a star Actual Displays the brightness value of the pixel your mouse cursor is pointing at Figure 10 This value is known as an Analog to Digital Unit ADU The camera can theoretically get as high as 65535 ADUs in value The image will start to saturate or overexpose at around 50 000 ADU This demonstrates the large range in brightness that 16 bits of data has and is one of the reasons the StarShoot G3 can capture dynamic images with faint detail Maximum Displays the highest ADU pixel value for the immediate area Minimum Displays the lowest ADU pixel value for the immediate area Average Displays the average ADU pixel value for the immediate area This is useful to see the general value of an area without letting a hot pixel throw off your reading Std Dev Displays the standard deviation for the immediate area Global Displays the Std Dev Average Maximum Minimum pixel values for the entire image Star Pay attention to the Half Flux Diameter HFD value when pointing the mouse cursor at
26. the pin diagram for the SSAG and ST 4 compatible mounts Auto guider port 22 23 8 Specifications StarShoot G3 Color CCD Sensor Sony ICX419AKL Color Sensor format 1 2 Pixel array 752 x 582 437 664 total Pixel size 8 6 m x 8 3 m Exposure range Indefinite A D conversion 16 bit Binning 1x1 1x2 2x1 and 2x2 Read Noise Approximately 9e Thermoelectric cooling 10 C below ambient temperature sealed dry air chamber to prevent CCD icing Operating Power Range 10VDC to 13 8VDC Camera current draw Approximately 1A at 12VDC with TEC on USB connection 2 0 High speed IR cut filter No Optical window Fully coated with anti reflection coatings Backfocus 3 5mm via 2 attachment 23mm via 1 25 nosepiece attachment 19mm via T thread attachment IR block No Weight 12 oz Autoguider capability Yes Mounting 1 25 nosepiece 2 nosepiece or T thread StarShoot G3 Monochrome CCD Sensor Sony ICX419ALL Monochrome Sensor format 1 2 Pixel array 752 x 582 437 664 total Pixel size 8 6 m x 8 3 m Exposure range Indefinite A D conversion 16 bit Binning 1x1 1x2 2x1 and 2x2 Read Noise Approximately 9e Thermoelectric cooling 10 C below ambient temperature sealed dry air chamber to prevent CCD icing Operating Power Range 10VDC to 13 8VDC Camera current draw Approximately 1A at 12VDC with TEC on USB connection 2 0 High
27. tible programs We recommend PHD Guiding which is freeware and rated as one of the best autoguiding software programs available Visit www stark labs com downloads html We recommend setting the camera to bin 2x2 when autoguiding especially for StarShoot G3 Color users Using the TEC will reduce the noise but is generally not a requirement for autoguiding You can save power and leave the TEC off while autoguiding Connect a standard RJ 12 cable from the G3 s autoguider relay port to the ST 4 compatible autoguider port on your equatorial mount Figures 22 1 and 22 2 Connect the G3 to the USB on you computer as you normally would and operate the camera with an ASCOM compatible program like PHD Guiding 7 Optional accessories For the StarShoot G3 Monochrome We recommend Orion 1 25 LRGB imaging filters and a filter wheel to capture high quality color images For the StarShoot G3 Color An optional IR blocking filter can be threaded to the G3 camera body to block the IR This can help sharpen your images and is especially helpful when used with some refractors which may allow more unfocused IR light to create color halos around bright stars Both cameras can benefit from a USB extension cable available from Orion We recommend a portable field battery to power the TEC Figure 22 1 The SSAG works with any mount equipped with an ST 4 compatible autoguide port shown here on the Sirius EQ G mount Figure 22 2 This is
28. tive capped The only data in the image is the inherent camera oise Figure 14 The noise contains the dark current read noise noise introduced during camera readout and download and hot pixels bright dots in the image All of this noise exists in your raw astro image too which distracts from the detail you want to see To eliminate most of the camera noise you can take several dark frames average them then subtract them from your astro images also called light images Note Make sure the CCD temperature is the same as was when took your light frames To take dark frames for subtraction from light images 1 Set the Exposure Type to Dark in the Capture tab Or if you are taking a sequence of images set the Type in the Sequence window to Dark this will also assign a D suffix to your saved file name so you can easily identify your darks later Note to StarShoot G3 Color users You must take Raw Light frames in monochrome BEFORE converting to color in order to utilize dark frames 2 Use the same exposure time as the light images you have or will take If your light image is 60 seconds the dark frame must also be 60 seconds 3 Click Start or Run Sequence if you are taking several darks Camera Studio will remind you to cover your telescope Remember to always cover your telescope before taking a dark and be sure to uncover it again when taking light frames Flat Fields A flat field is an image ta
29. ve CCD chip can easily detect vignetting through a telescope even specialized astrographs Vignetting is more apparent when the telescope s illuminated field is not large enough to illuminate the full area of the CCD chip As a result more light is detected in the center of the image compared to the edge In general vignetting should not be a problem on the format CCD inside the G3 Dust and Particles Dust and particles Figure 15 2 will inevitably show up in your raw astroimages Large particles on the CCD optical window sometimes look like unfocused circles or doughnuts in your images It s too late to clean your camera if you are already imaging in the field at night And even when the camera is clean dust usually finds a way to show up in your images To take a flat field image 1 Ensure that the telescope is focused and ready for astro imaging 2 Point the telescope at a uniform and featureless light source like the sky at dusk or dawn or a blank white sheet of paper Make sure the camera orientation is exactly the same as it is or was for astro imaging Although the telescope is pointing at a featureless surface the focus and orientation must be set as it normally would be for astro images 3 Set the Exposure Type to Flat in the Capture tab Or if you are taking a sequence of images set the Type in the Sequence window to Flat this will also assign a F suffix to your saved file name so you can eas
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