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Binoculars - 12968a_11
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Lookout Training Handbook - Military training manual for keeping a lookout
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Use & Care
to obtain proper focus and correct distance between lenses. To obtain proper focus, observe the following steps: 1. Set both eyepieces to the +4 mark. 2. Place the binoculars firmly against the eyebrows and  locate  a  small,  well-defined  object  about  l/2-mile distant. 3. Cover one lens (do not touch the glass). 4. Slowly turn the other eyepiece until you see a sharp image, then back off as far as possible without losing the sharpness. (Keep both eyes open; closing one will give an incorrect focus.) 5. Note the reading on the scale, then repeat the above procedure two or three times to obtain the exact setting. 6. Follow the same procedure for the opposite eye. The  final  adjustment  is  to  establish  the  inter- pupillary  distance  (IPD),  which  is  the  distance  between your eyes. Move the barrels up and down until you see a  single  circle,  as  shown  in  figure  3,  then  note  the reading on the IPD vernier between the barrels. An incorrect IPD setting will strain the eyes and waste part of the binoculars' light-gathering ability. You will not have your own personal binoculars— they are passed from watch to watch—so it is important Figure 3.—Proper IPD setting. 8

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