USING YOUR BT-ED70S-A BINOCULAR TELESCOPE
ALIGNMENT
1The BT-ED70S-A has threaded sockets of 1/4”-20 and
a 3/8”on the bottom of the dovetail bar that fit directly
to a camera tripod.
3
While looking through the right side eyepiece, turn the focus
ring on the right side prism housing until the image appears in
sharp focus. Next, look through the left side eyepiece and
adjust the focus of the left side eyepiece in the same way by
turning the left side focus ring.
2
Attach the eyepieces so that the chrome barrel of the eyepiece
is push into the eyepiece holder and fixed by friction. When
you exchange the eyepieces, you should align the optical axis
of left side and right side eyepieces in the procedure stated in
ALIGNMEMT.
4
Adjust the interpupillary width to your eyes. Hold the left and
right side prism housings with both hands and rotate them
inward equally so that the both eyepieces come to a position
that fits your eyes. It is a point that circles of field of view in the
left and right eyepieces become one completely.
How to Adjust a Double Vision
1Look through the left side eyepiece and find an object
further than 1,000m distant. Put the object in the field of
view so that it lies on the imaginary horizontal center line of
the field of view, and shift it to the very right edge. An
electric pole is shown here as a sample.
The object near the edge of the field of view makes your
recognition of a position of the object against the field of
view circle easier.
If the object is seen at the same level and position on the
right side eyepiece as seen with the left side eyepiece, it
shows that the eyepieces are aligned correctly.
If not, rotate the right side eyepiece slowly clockwise or
counterclockwise until the object moves toward the same position.
2
If the above does not align the optics correctly, then rotate
the left side eyepiece slowly while keeping the right side
eyepiece as it is.
TIPS ON GENRAL OBSERVATION WITH BT-ED70S-A
The object can be seen clearer and brighter at low
magnification. It is desirable to start with a pair of eyepieces with low magnification and exchange them for eyepieces with
medium magnification. It will be hard to align the optical axis at high magnification due to the structure of binocular telescopes.
It is advisable to use with the Vixen NLV or LVW eyepieces with focal length longer than 10mm for high magnification.
It may be possible that a double vision occurs from the character of binoculars when you attach the eyepieces without
a consideration for optical alignment. In this case, make adjustments of the optical axis in the following procedure.
1Left
Right
Right
Left
1 2
3 4
2
Dovetail bar
1/4”-20
3/8”
Right side
prism housing
Left side
prism housing
Eyepieces
(Optional)
Eyepiece holder
Chrome
barrel
Camera tripod
Left side focus ring
Dovetail bar
1/4”-20
3/8”
Right side
prism housing
Left side
prism housing
Eyepieces
(Optional)
Eyepiece holder
Chrome
barrel
Camera tripod
Left side focus ring Right side focus ring
Right side focus ring
Imaginary horizontal center line
Shift the object to the very right edge
60キ-12-0.1S-50-（PIXEL1160）（M）
5-17-3 Higashitokorozawa,Tokorozawa,Saitama359-0021, Japan
Phone +81-4-2944-4141(International)
F a x +81-4-2944-9722(International)
http://www.vixen.co.jp
