Steiner Optik 7x50 Commander Binoculars - Manuel (Page 11)

11
Different types of eyeglasses might vary the distance
between the eye and the lens and it’s possible that your
eyes are too close to the ocular. You will see some black
areas when looking through the binoculars. In this case
you need to increase the distance by slightly twisting the
eyecup upwards (usually just a few millimeters) until you
see a complete image.
wearing contact lenses or no eye glasses
You need to create a distance between your eyes and the
binoculars' ocular lenses. Use the binoculars only with eye-
cups in the up position. On both eyecups you will also find
small wings that prevent sidelight to enter and increase
image clarity. To turn the eyecups simply use your thumb
and index finger and twist the eyecups down. To twist
them up, turn them in the other direction until you can
feel the noticeable stop limit - after that you will only be
able to minimally turn the eyecup. This play is necessary to
adjust the sidelight screen for different users' interpupilary
distances.
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