Vortex Optics VIPER HD 15X50 ROOF PRISM BINOCULAR - Manual (Page 2)

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Objective Lens
Ocular Lens
Twist-up Eyecup
Strap
Attachment
Tripod Adapter Socket
Center Focus
Locking
Diopter
IPD
The eyecups on a Viper® HD 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 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.
B
asic
O
peratiOn
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.