Orion 100mm User's Manual
Contents
1. ED s 1 25 adapter coupling the camera body to the telescope Use the camera s viewfinder to frame the picture Use the telescope s focuser to focus the image Tighten the focuser tension thumbscrew to make sure the camera does not slip out of focus You may want to consider using a remote shutter release instead of the shutter release on the camera Touching the camera can vibrate the system and blur the resulting photo graphic image Also be sure to use a solid tripod Care amp Maintenance Give your telescope reasonable care and it will last a lifetime When not in use keep its dust cover on as well as the dust cap for the eyepiece opening Store it indoors or in a dry garage Do not leave the telescope outside when not in use The opti cal tube is aluminum and has a smooth painted surface that should resist scratches and smudges If a scratch does appear on the tube it will not harm the telescope Smudges on the tube can be wiped off with standard household cleaners such as Windex or Formula 409 Any quality optical lens tissue and cleaning fluid specifically designed for multi coated optics can be used to clean the telescope s objective lens as well as the lenses of eyepieces and finder scopes Never use regular glass cleaner or clean ing fluid designed for eyeglasses Before cleaning with fluid and tissue blow any loose particles off the lens with a blower bulb or compressed air or lightly brush the lens with a soft2. TELESCOPES amp BINOCULARS Providing Exceptional Consumer Optical Products Since 1975 Machined aluminum lens cell Finder scope dovetail mount 2 Crayford focuser 1 25 Eyepiece adapter Crayford focuser tension thumbscrew Use of Optional Eyepieces Diagonal and Finder Scope The 100mm ED does not come with a finder scope diagonal or eyepieces in order to grant the user the greatest versatil ity in customizing the instrument to suit their tastes However certain rules for using accessories still apply Any Orion finder scope with a dovetail bracket can be used with the 100mm f 9 ED Simply unthread the thumbscrew on the dovetail mount Figure 1 and insert the assembled finder scope and dovetail bracket Retighten the thumbscrew Finder scopes that do not use a dovetail bracket will need to be attached by other means The 100mm ED can use almost any 1 25 diagonal and eye piece To install a diagonal unthread the thumbscrew on the 1 25 adapter Figure 1 until it is flush with the interior of the adapter Insert the diagonal and secure it with the thumbscrew Then insert the eyepiece into the diagonal and secure it with the thumbscrew Use of 2 Eyepieces and Diagonals A feature of the 100mm ED is its ability to also use 2 barrel diameter eyepieces and diagonals At low magnifications 2 eyepieces can give a wider field of view than standard 1 25 eyepieces This is especially desirable for observing deep sky o
3. camel hair brush Apply some cleaning fluid to a tissue never directly on the optics Wipe the lens gently in a circular motion then remove any excess fluid with a fresh lens tissue Oily fin gerprints and smudges may be removed using this method Use caution rubbing too hard may scratch the lens Clean only a small area at a time using a fresh lens tissue on each area Never reuse tissues Specifications Optical tube Seamless aluminum Objective lens diameter 100mm 3 9 Objective lens Apochromatic rear element made of ED glass air spaced Objective lens coating Fully multi coated Lens cell Machined aluminum Focal length 900mm Focal ratio f 9 0 Focuser Crayford accepts 1 25 or 2 accessories and camera T Ring Weight 7 lbs Length 35 5 One Year Limited Warranty This 100mm f 9 ED Refractor is warranted against defects in materials 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 regis tered 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 abu
4. view than a dim and fuzzy overmagnified image Note About Chromatic Aberration Chromatic aberration literally means color distortion Whenever light passes through one material to another light of different wavelengths color is bent by different amounts This is a problem that plagues refractor type telescopes since light passes through both air and glass to form an image Most astronomical objects emit a spectrum comprised of many dif ferent wavelengths of light so each wavelength will be bent by a slightly different amount when passing through a lens This results in each color of light reaching precise focus at a slightly different point which reduces image sharpness The 100mm ED is designed to minimize chromatic aberration The objective lens comprises two individual lens elements one of which is made of ED Extra low Dispersion glass a special type of glass that has superior refractive properties compared to normal types of glass The use of this ED glass minimizes the amount of chromatic aberration resulting in a cleaner sharper image compared to that in standard achromatic telescopes Photography with the 100mm ED Refractor With an optional camera adapter the 100mm f 9 ED becomes a 900mm f 9 telephoto lens for a single lens reflex camera For long distance terrestrial or astronomical photography you need only a T ring for your particular camera model The T ring attaches to your camera and threads onto the 100mm
5. INSTRUCTION MANUAL 100mm f 9 ED Refractor 9975 Optical Tube Assembly Dew Glare shield Focus wheel 2 Figure 1 The 100mm f 9 ED Refractor optical tube assembly Congratulations on your purchase of an Orion 100mm 9 ED refractor optical tube Your 100mm f 9 ED has been designed with high quality optics and excellent mechanical construction The ED glass in the objective lens means you ll enjoy images with far less color distortion than those seen in a standard refractor and the smooth Crayford focuser will make getting sharp images a breeze These instructions will help you set up and use your telescope tube Getting Started The 100mm f 9 ED comes fully assembled from the factory The telescope s optics have been installed and collimated so you should not have to make any adjustments to them Please keep the original shipping box In the unlikely event you should need to ship the telescope back to Orion for war ranty repair service you should use the original packaging The box also makes a very good container for storing the tele scope when it is not in use Attaching the Refractor to a Tripod or Mount Optional tube rings should be used to attach the scope to a telescope mount Tube rings with an inner diameter of 100mm 3 9 such as Orion item 7371 are needed When using tube rings you should first attach them to your telescope mount and then lay the optical tube in the tube rings on ORION
6. bjects as many of them appear quite large but faint Please note that the 100mm ED will not reach focus with the 2 eye pieces unless a 2 diagonal or extension tube is used Customer Support 800 676 1343 E mail support telescope com Corporate Offices 831 763 7000 P O Box 1815 Santa Cruz CA 95061 IN 247 REV A 5 04 To use 2 eyepieces simply loosen the two large thumbscrews on the 2 adapter Figure 1 Once these thumbscrews are loosened the entire back end of the focuser including any 1 25 diagonal and eyepiece that may be attached comes off exposing the 2 diameter focuser drawtube Now insert your 2 diagonal or extension tube into the drawtube and secure with the two thumbscrews loosened previously Insert a 2 eyepiece into the diagonal secure it in place with the thumb screw on the diagonal and you re ready to observe Note About the 2 Crayford Focuser The 100mm ED comes equipped with a Crayford focuser The Crayford design allows for smooth precise focusing without any image shift that typical rack and pinion designs experi ence If you find that the focus wheels are too tight or too loose you can make adjustments to the focuser tension by using the focuser tension thumbscrew located on the bottom of the opti cal tube between the focus wheels Make adjustments to this thumbscrew until the focuser motion feels comfortable Please note that you must have at least some tension applied to the focuser draw
7. sed 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 informa tion contact Customer Service Department Orion Telescopes amp Binoculars P O Box 1815 Santa Cruz CA 95061 800 676 1343 Orion Telescopes amp Binoculars Post Office Box 1815 Santa Cruz CA 95061 Customer Support Help Line 800 676 1343 Day or Evening
8. tube or else it will not move when you turn the focus wheels Calculating Magnification Power It is desirable to have a range of eyepieces of different focal lengths to allow viewing over a range of magnifications To calculate the magnification or power of a telescope simply divide the focal length of the telescope by the focal length of the eyepiece Telescope F L Eyepiece F L Magnification For example the 100mm ED which has a focal length of 900mm used in combination with a 25mm eyepiece yields a power of 36x 900 25 36X Every telescope has a useful limit of power of about 45x 60x per inch of aperture Claims of higher power by some tele scope manufacturers are a misleading advertising gimmick and should be dismissed Keep in mind that at higher pow ers an image will always be dimmer and less sharp this is a fundamental law of optics The steadiness of the air the see ing will limit how much magnification an image can tolerate Always start viewing with your lowest power longest focal length eyepiece in the telescope After you have located and looked at the object with it you can try switching to a higher power eyepiece to ferret out more detail if atmospheric conditions permit If the image you see is not crisp and steady reduce the magnification by switching to a longer focal length eyepiece As a general rule a small but well resolved image will show more detail and provide a more enjoyable
Download Pdf Manuals
Related Search