Quantcast Binoculars - 12968a_11

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Proper IPD Setting
BINOCULARS The  most  commonly  used  optical  equipment  is  a set of binoculars (figure 2). The size of binoculars deemed most  useful  for  marine  work  is  7  x  50;  that  means  the glasses have a magnification of 7 power and an objective lens  50  mm  in  diameter.  This  ratio  of  magnification  is  a satisfying compromise between the need for magnification and the reduction of angle, or field of view, that results as the magnification is increased. Large objective lenses have excellent    light-gathering    characteristics,    making    them particularly suitable for night use. Adjustments To   gain   maximum   benefit   from   the   light-gathering quality  of   binoculars,  you  must  adjust  the  binoculars Figure 2.—7 x 50 binoculars. 7

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