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VIXEN BT80M-A BINOCULAR TELESCOPE

Eyepiece Eyepiece Lock Ring

Focusing Ring

Prism Housing

Diagonal Prism Housing

Photo Tripod Adapter

Objective Lens

Lens Shade

Body Tube Handle

Vixen BT80M-A Specifications:

Objective Performance

Aperture 80mm Magnification 36x

Focal Length 900mm Angular field of view 1.11

Aperture Ratio 1:11.2 Linear Field of View 19m at 1000m

Optical Composition 2 Air spaced compo-

nents with built in tele-

extender

Exit Pupil 2.22m

Magnification can be changed by using other op-

tional Vixen NLV Eyepieces

Coatings Magenta coated

Eyepiece Measurements

Optical Composition 2 group - 4 element

OR25mm

Size 23 in x 7.5 in x 8.5 in

(58cm x 19cm x 21.5cm)

Coatings Multi Coated Weight 11 lbs (5kg)

Using your BT80M-A Vixen Binocular Telescope

1. To install on a photo tripod, screw the photo tripod adapter on the pan head of the tripod.

2. Aligning 3 Dots: Align the three dots marked on the eyepiece, focusing ring and prism housing in

red for the right side of the binocular telescope and in green for the left side. Optical axis is now

collimated and focus is adjusted to infinity.

3. Adjust the inter pupillary distance: Hold the right and left prism housings with your hand and

look through the binocular telescope while turning them until one clear circle of image is seen.

4. Focusing: Close your left eye and look through the right eyepiece with your right eye. Rotate the

focusing ring of the right eyepiece until the image appears in sharp focus. Next, close your right

eye and look through the left eyepiece with your left eye. Rotate the focusing ring of the left

eyepiece until the image appears in sharp focus.

Vary the magnification by using other Vixen NLV Eyepieces. However, these are not marked

with aligning dots for collimating the optical axes. The following adjustment may be required.

Look through the left eyepiece and find an object in ex-

cess of 1000 yds away. Bring the object to the right edge

of the horizontal center in the field of view. Then look

through the right eyepiece. If the object is seen at a level

with the image of the left eyepiece, the optical collimation

is good. If not, rotate the right eyepiece slowly clockwise

or counter clockwise until it is seen at a level with the im-

age in the left eyepiece.

If it is not possible to level it with the image of the left

eyepiece by rotating the right eyepiece. Try to do the

same adjustment as the above by rotating the left eyepiece.

Note: At a low power, an object can be seen clearly and brightly. It is advisable to being

with a low power eyepiece having a long focal length and to change it gradually to a high

power eyepiece having a short focal length. When using the nlv25mm eyepiece on the Vixen

BT80M-A, power will by 36x which is fairly high in comparison with magnification of ordi-

nary binoculars.