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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Spotting Scope Power??
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<blockquote data-quote="Trickymissfit" data-source="post: 557464" data-attributes="member: 25383"><p>think mof it this way: Divide the lense diameter with the power. This gives you the actual light transmission you'll see. Ideally you want a factor of three. An 82mm lense divided by 27x gives you 3.03. The same lense divided by 45x gives you 1.82. Ok, but getting somewhat marginal. Kowa is now selling an 88mm lensed scope that will still only give you 1.95, but still better. A 20x scope with a 60mm lense will give you about 3.0, but with a field of view loss in that matters a lot. I use an 82mm lense with a 27x eyepiece, and that's a very bright scope to look thru. It has all the resolution I ever could use.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 557464, member: 25383"] think mof it this way: Divide the lense diameter with the power. This gives you the actual light transmission you'll see. Ideally you want a factor of three. An 82mm lense divided by 27x gives you 3.03. The same lense divided by 45x gives you 1.82. Ok, but getting somewhat marginal. Kowa is now selling an 88mm lensed scope that will still only give you 1.95, but still better. A 20x scope with a 60mm lense will give you about 3.0, but with a field of view loss in that matters a lot. I use an 82mm lense with a 27x eyepiece, and that's a very bright scope to look thru. It has all the resolution I ever could use. gary [/QUOTE]
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Long Range Scopes and Other Optics
Spotting Scope Power??
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