Berger & Schroter 32188 Operating Instructions Manual page 12

Properly focus the binocular
For the best views, follow the 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 binocu-
lar 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 diopters by first closing your left eye or covering the left
objective with your hand. Look through your right eye and adjust the di-
opters to the right or left (on the right eyepiece) until the object is in
focus.
Make note of this diopter setting in case you need to set it again. From
this point, you will only need to use the center focus wheel.
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