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Razor UHD 18x56官方数据:
Magnification 18x
Objective Lens Diameter 56 mm
Eye Relief 18 mm
Exit Pupil 3.1 mm
Linear Field of View 194 feet/1000 yds
Angular Field of View 3.7 degrees
Close Focus 10 feet
Interpupillary Distance 56-76 mm
Height 8.3 inches
Width 6.1 inches
Weight 41.6 oz
单位换算后的结果:
Linear Field of View 194 feet/1000 yds --> 64.67米/1000米
Angular Field of View 3.7 degrees --> tan(3.7/2) x 1000 x 2 = 64.6米 (千米视场)
以上2个数据基本吻合。
表观视场计算:arctan(64.6/2/(1000/18))x2 = 60.35 °
重量换算: 41.6 oz --> 1,179.34 g
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