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Objective Lens

Ocular Lens

Twist-up Eyecup

Strap
Attachment 

Tripod Adapter Socket

Center Focus

Diopter

IPD

The eyecups on a Diamondback

®

 binocular twist up 

and down so any viewer can see the full field and enjoy 

comfortable viewing—with or without eyeglasses.

When not using eyeglasses or 
sunglasses, keep the eyecups 
fully extended. For the best 
viewing when wearing glasses, 
twist eyecups down.

Adjust the interpupillary distance

The interpupillary distance (IPD) is the distance between the 
center of your left and right pupils. Match the IPD of your eyes 
and your binocular by rotating the barrels in or out until you see 
a single image free of shading.

B

asic

 O

peratiOn

Adjust the eyecups

Rotate the barrels in or out to 
match the IPD of your eyes with 
that of the binocular.

Distance between the centers 
of the ocular lenses.

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