Vortex Optics VIPER 10X28 BINOCULAR - Manual (Page 2)

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Objective Lens
Ocular Lens
Twist-up Eyecup
Strap
Attachment
Center Focus
Diopter
IPD
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
The eyecups on the Viper ® compact binocular twist up and
down so any viewer can see the full field and enjoy comfortable
viewing—with or without eyeglasses.
Rotate the binocular barrels
inward or outward to line your
eyes up with ocular lenses. Distance between the centers
of the ocular lenses.
Please read the entire manual before using your new optic.