User Manual
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 fi eld and enjoy comfortable viewing—
with or without eyeglasses.
When not using eyeglasses or 
sunglasses, keep the eyecups fully 
extended. For the best viewing 
when viewing through eyeglasses, 
twist eyecups down.
Adjust the interpupillary distance
The interpupillary distance (IPD) is the distance between the centers 
of the left and right eye pupils. Match the IPD of your eyes to that of 
the binocular so that you see a single image that is free of shading.
BASIC OPERATION
Adjust the eyecups
Rotate the binocular barrels 
inward or outward to line your 
eyes up with ocular lenses.
Distance between the centers 
of the ocular lenses.
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