Orion BT70 User Manual

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  
Corporate Offices (831) 763-7000  
Providing Exceptional Consumer Optical Products Since 1975  
89 Hangar Way, Watsonville, CA 95076  
IN 307 Rev. B 02/09  
Since everyone’s eyes focus images slightly differently,  
different observers will need to refocus the binoculars for  
their own vision.  
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.  
Fold-Down Eyeguards  
Avoid unnecessary shocks to the binocular, whether it is in its  
case or not. Although the BT70 is designed to be mechanically  
rugged, excessive impacts may cause the optics to become  
misaligned. This is not covered by the warranty.  
BT70 binoculars feature fold-down eyeguards on the  
eyepieces. The eyeguards are usually left in the up position  
for use without 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.  
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.  
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!  
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.  
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 over-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  
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Specifications  
Objective lenses:  
70mm clear aperture, air-spaced  
achromatic doublets  
Body design:  
Interior:  
All metal construction, single  
piece body design, waterproof  
Magnification:  
20x eyepieces included, other  
magnification eyepieces  
available from Orion  
Glare threaded, baffled,  
blackened  
Lens shades:  
Weight:  
Retractable  
Focusing:  
Individual focus eyepieces  
8 lbs. 15 oz.  
Field of view:  
Eye relief:  
3.2° for the included eyepieces  
Mounting provision:  
Carry handle:  
Dust covers:  
1⁄4"-20 mounting plate  
Included, metal, removable  
16mm for the included  
eyepieces  
Metal covers for objective  
lenses, rubber caps for  
eyepieces and eyepiece holders  
Close focus:  
Prisms:  
50 feet  
BAK-4, porro, provide 90°  
viewing angle  
Case:  
Custom foam-lined hard carry  
case included, removable  
shoulder strap, 2x lock latches  
with keys  
Anti-reflection coatings:  
Eyeguards:  
Fully multi-coated  
Fold-down, rubber  
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 & 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 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.  
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