Vivitar AQUA VIV-AV-750 - Manual (Page 6)

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Using Your Binoculars
1. Hold the binoculars close to your face so that the eyepieces line up to
your eyes. Use both hands to hold each barrel firmly.
2. Pull the barrels together or apart so that the eyepieces are suitably
spaced to account for the distance between your eyes.
3. Set the Diopter Knob to zero.
4. Look through the binoculars and focus on an object of your choosing.
5. Cover the right Objective Lens so that you will be looking through
your left eye only.
6. Rotate the Center Focus Knob until the object you are viewing with
your left eye looks sharp and clear. At this point the object is in focus.
7. Uncover the right Objective Lens and now cover the left Objective
Lens so that you will be looking through your right eye only.
8. Again look at the object of your choice and now rotate the Diopter
Knob until the object you see through your right eye is sharp and
clear. At this point the object is in focus. Center
Focus
Knob
Eyepiece
Diopter
Knob
Objective
lens
9. Now with a turn of the Center Focus Knob, only, both near and far objects can be brought into focus.