Orion BT70 - Manual (Page 3)

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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 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.
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 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
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 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.