Vortex Optics VIPER HD 15X50 ROOF PRISM BINOCULAR - Manual (Page 3)

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Properly focus the binocular
For the best views, follow this two-step process to properly adjust
the center focus and diopter. Choose an object that is about 20
yards away from you and stay in the same spot until you have
adjusted the binocular for your eyes.
1. Adjust the center focus—start by closing your right eye
or covering the right objective lens
with your hand. Focus your left eye
on the object and adjust the center
focus wheel until the image is in focus.
Leave the center focus in this position
as you adjust the diopter.
2. Adjust the diopter—start by closing your left eye or covering
the left objective lens with your hand.
Look through your right eye, pull
the diopter ring (found on the right
eyepiece) toward your eye and adjust
the diopter until the object is in focus.
Then, push the diopter ring back down
to lock your settings. Make note of this diopter setting in case
you need to set it again. From this point on, you will only need
to use the center focus wheel.
The Viper HD comes with a rainguard for the ocular lenses and
tethered objective lens covers. Use these covers to protect the
lenses whenever you are not viewing.
Lens Covers
The Viper HD’s protective case provides safe storage between
viewing sessions. The carry strap is already attached to the case.
Carry Case
a
ccessOries
Securely attach your binocular to the binocular strap:
Neckstrap
1. Thread the end of the
strap from the bottom
up through the strap
attachment loop. 3. Adjust the overall
length and pull the strap
webbing tight so it is
secure within the buckle. 2. Hold the buckle
and thread the end
of the strap inside
the buckle.
Note: Please do not thread a metal ring directly onto the strap
attachment loop when attaching rings or clips for other after-market
equipment. Instead, use nylon zip ties according to the manufacturer’s
instructions.