Orion BT70 User's Manual
Contents
1. s will provide viewing enjoyment for years to come Please take the time to read this instruction sheet before using your new binoculars WARNING Never look directly at the Sun through your binoculars without professionally made solar filters even for an instant or permanent eye damage could result Young children should use these binoculars on sunny days only with adult supervision Using a Tripod When observing with large aperture binoculars like the Orion BT70s a sturdy photo tripod or altazimuth mount is required This is because the weight and magnification of the binoculars make it impossible to hold them steady with your hands To attach the BT70 to a photo tripod simply thread the tripod s 14 20 mounting stud into the threaded hole in the BT70 s mounting plate The tripod must be able to support approximately 10 Ibs otherwise it may not be stable enough for the BT70 To attach the BT70 to an altazimuth mount that utilizes a dovetail holder like the Orion VersaGo mount an optional dovetail L bracket is needed The L bracket connects to the BT70 s mounting plate and has a dovetail bar that goes directly into the mount s dovetail holder Contact Orion to order this optional L bracket Inserting the Eyepieces Perhaps the most unique feature of the BT70 is its ability to change eyepieces The two supplied eyepieces provide a magnification of 20x but other magnifications can be obtained by purcha2. copy of the original invoice is required 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
3. INSTRUCTION MANUAL Orion BT70 Binocular Telescope 9547 IP Knob not visible Diopter scale Handle Eyepiece holders Dovetail holder for handle Mounting plate not visible Lens shades retracted Figure 1 The Orion BT70 Binocular Telescope Customer Support 800 676 1343 _ ORIONI E mail support telescope com TELESCOPES amp BINOCULARS Corporate Offices 831 763 7000 Providing Exceptional Consumer Optical Products Since 1975 89 Hangar Way Watsonville CA 95076 IN 307 Rev B 02 09 Congratulations on your purchase of a pair of quality Orion binoculars The BT70 Binocular Telescope provides the large light grasp you need for astronomical observation but unlike a telescope allows you to use both eyes simultaneously for viewing This results in better image resolution contrast and brightness than a similar sized telescope can provide The BT70 is a true binocular telescope with optical quality and features you d expect of a fine astronomical instrument The included eyepieces provide 20x magnification but optional interchangeable eyepieces available from Orion let you vary the magnification for deep sky solar system and terrestrial viewing with 3D like depth of field The 90 eyepiece viewing angle makes nighttime observing more comfortable as the binoculars don t need to be positioned above your head when looking upwards The rugged body construction and waterproof design ensure the BT70
4. cal alignment better For astronomical observation individual focus eyepieces are usually preferred Pick an object in the distance to view At night best focus will be achieved by focusing on a bright star Cover your right eye or cover the right objective lens of the binocular and focus the left eyepiece by rotating the rubber grip ring on the eyepiece holder it until the image appears clearest Then cover your left eye or cover the left objective lens of the binocular and focus the right eyepiece by rotating the eyepiece holder until the image appears clearest The binoculars are now focused If you want to view an object at a different distance re focusing of both eyepieces is required Also changing eyepieces may require some slight refocusing For astronomical observation all objects will always appear focused at the infinity focus point This means you only need to focus the binoculars once per observing session This also means you can take note of the diopter scale Figure 1 setting for each eyepiece when focused on an astronomical object and return to those settings when observing another night You will find this to be a great convenience Since everyone s eyes focus images slightly differently different observers will need to refocus the binoculars for their own vision Fold Down Eyeguards BT70 binoculars feature fold down eyeguards on the eyepieces The eyeguards are usually left in the up position for use with
5. is designed to be mechanically rugged excessive impacts may cause the optics to become misaligned This is not covered by the warranty A metal carry handle is supplied with the BT70 This connects to the dovetail holder on the binoculars which is located just in front of the eyepieces Figure 1 Slide the handle s base into the dovetail holder and secure it in place with the thumbscrew The handle comes in quite handy when attempting to mount the BT70 onto a tripod Before the BT70 can be placed into its case the handle must be removed Allow the optics to slowly adjust to cold weather by storing the instrument in its case in a cold area such as an unheated garage or the trunk of a car for a few hours before use When bringing the instrument back inside a warm house open up the case remove the binoculars remove the cover caps and let everything dry out The binoculars should be stored in a cool dry place to prevent mold growth which can damage the optics This is not covered by the warranty Specifications Objective lenses 70mm clear aperture air spaced Body design All metal construction single achromatic doublets piece body design waterproof Magnification 20x eyepieces included other Interior Glare threaded baffled magnification eyepieces blackened available from Orion Lens shades Retractable Focusing Individual focus eyepieces Weight 8 lbs 15 oz Field of view 3 2 for the included eyepieces Mounting provisi
6. on 1 4 20 mounting plate Eye relief 16mm for the included Carry handle Included metal removable eyepieces o Dust covers Metal covers for objective Close focus 50 feet lenses rubber caps for Prisms BAK 4 porro provide 90 eyepieces and eyepiece holders viewing angle Case Custom foam lined hard carry Anti reflection coatings Fully multi coated case included removable Eyeguards Fold down rubber shoulder strap 2x lock latches with keys One Year Limited Warranty This Orion BT70 Binocular Telescope 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 pur chaser 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 This warranty specifically does not cover abuse modification mishandling self repair or normal wear and tear including mold growth Binocular collimation alignment of the optics is specifically not covered beyond the 30 day return period Binoculars go out of collimation only if they are dropped or bumped Binocular collimation and cleaning are considered routine maintenance and should be done every five years or when necessary If the product is not registered proof of purchase such as a
7. out eyeglasses as this helps prevent glare from entering between your eye and the eyepieces To use the binoculars with eyeglasses you will need to fold the eyeguards down in order to get your eyes close enough to the eyepieces to see the entire field of view Waterproof Binoculars The BT70 is nitrogen purged and sealed to be waterproof and internally fogproof While it is impervious to rain wind splashing and humidity do not immerse the binocular in water under any circumstances If the binocular becomes wet with fresh water merely blot it dry with a clean cloth and clean the lens surfaces as outlined below Saltwater should be rinsed off completely and the binocular then blotted dry and its lenses cleaned as outlined below If the binocular body becomes dirty it can be cleaned with warm water and a clean cloth If extremely dirty or oily clean the body with a dilute solution of warm water and mild soap on a cloth then rinse with clean water and blot dry Do not clean lens surfaces with soap and water Cleaning and Care of Binocular Lenses The lens surfaces of Orion binoculars are coated with anti reflection multi coatings that can be damaged with careless handling Avoid touching lens surfaces with fingers or any coarse material All optics even if stored should be cleaned at least once a year or whenever they are dirty The dust that builds up on coatings promotes mold growth which etches glass and destroys coatings Avoid ove
8. r cleaning it can also damage the coatings Always use lens cleaning tissue and fluid that are specifically designed for multicoated lenses Do not use fluids or tissues that are for eyeglasses or household use Never attempt to disassemble the binocular or eyepieces in order to clean them this can also void the warranty To clean the binocular and eyepiece lenses first blow off the lens with a blower bulb or gently wipe the lens with a lens cleaning brush to remove the larger particles Put a few drops of lens cleaning fluid on a fresh piece of lens cleaning tissue never on the lens and gently wipe the lens Quickly wipe the excess fluid with a new dry piece of lens cleaning tissue For larger lenses clean only a small area at a time using a new tissue each time On excessively dirty lenses wipe across the lens using one stroke for each tissue alternating wet and dry Always avoid excessive pressure or rubbing when wiping as wiping too hard can scratch the lens Storage and Transport The BT70 binoculars come with a heavy duty case for safe storage and transport We recommend always keeping the binoculars in their case with the cover caps on when not in use The case has a lock on each latch for extra security Use one of the supplied keys to lock and unlock the latches A removable shoulder strap is also provided for ease of transport Avoid unnecessary shocks to the binocular whether it is in its case or not Although the BT70
9. sing optional eyepiece sets from Orion To install the eyepieces first remove the cover caps from the binoculars and eyepieces Then simply insert the eyepieces into the binoculars eyepiece holders Figure 1 Push the eyepieces into the holders until they are fully seated To remove the eyepieces just pull the eyepieces out of their holders Extending the Lens Shades Another nice feature of the BT70 is its extendable lens shades Figure 1 These increase image contrast by preventing glare unwanted stray light from entering the objective lenses of the binoculars They also slow the formation of dew on the objective lens exteriors To use the lens shades grasp them with your fingers and pull them outwards You will need to retract the lens shades to fit the binoculars into its case Adjusting the Distance Between Your Eyes Interpupillary Distance Adjusting the interpupillary IP distance of the BT70 is incredibly easy Simply turn the chrome IP knob located between the eyepieces Rotate the knob until the distance between the eyepieces matches the distance between your eyes When properly adjusted you should see a single round field of view when looking through the binoculars Make this adjustment before you attempt to focus the binoculars Focusing The BT70 binoculars utilize individual focus eyepieces This makes the binoculars mechanically more rugged than similar center focus models and generally maintains opti
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