| The Numbers Game |
| 8 X 42, 8°,
140m/1000m |
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| Size of
objective lens (mm.) The larger |
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| the size, the
heavier, but the more light and |
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| increased field of view |
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| Magnification - 8 x
larger |
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| image than the
naked eye |
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| 42/8 =
5.25mm exit pupil |
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| (width of light
beam entering eye) |
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| Eye Relief -
distance behind eye piece where image is in |
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| focus. If you
wear glasses, get a long eye relief (15-20mm) |
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