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<blockquote data-quote="Bob Blaylock" data-source="post: 500380" data-attributes="member: 16749"><p><strong>Re: converting camera lens MM to spotting scope power (X)</strong></p><p></p><p>It occurs to me, now, that there may be one more factor, that I haven't accounted for, and for which I cannot account; having to do with the optics of the adaptor that connects the spotting scope to the camera. Most likely, it's a fixed factor, that would be multiplied by N to work it into my formulas. Let us call this factor A.</p><p></p><p> So, to modify my above formulae, now we have…</p><p></p><p></p><p>Where…<ul style="margin-left: 20px"> <li data-xf-list-type="ul">N = the “normal lens” focal length for the sensor, or in other words, the diagonal measure of the sensor itself (28mm in the case of your D3200)…</li> <li data-xf-list-type="ul">F = the focal length of the lens in question…</li> <li data-xf-list-type="ul">M = the magnification factor…<br /> …and…</li> <li data-xf-list-type="ul">A = This unknown correction for the adaptor itself.</li> </ul><p></p><p> The conversion would be…<ul style="margin-left: 20px"> <li data-xf-list-type="ul">M = F÷(N×A)<br /> …or…</li> <li data-xf-list-type="ul">F = M×N×A</li> </ul><p></p><p> I cannot make any good guess as to what the value of A might be, but perhaps if you were to contact the manufacturer of the adaptor, show them my math, perhaps they can provide this missing value.</p></blockquote><p></p>
[QUOTE="Bob Blaylock, post: 500380, member: 16749"] [b]Re: converting camera lens MM to spotting scope power (X)[/b] It occurs to me, now, that there may be one more factor, that I haven't accounted for, and for which I cannot account; having to do with the optics of the adaptor that connects the spotting scope to the camera. Most likely, it's a fixed factor, that would be multiplied by N to work it into my formulas. Let us call this factor A. So, to modify my above formulae, now we have… Where…[indent][list][*]N = the “normal lens” focal length for the sensor, or in other words, the diagonal measure of the sensor itself (28mm in the case of your D3200)… [*]F = the focal length of the lens in question… [*]M = the magnification factor… …and… [*]A = This unknown correction for the adaptor itself.[/list][/indent] The conversion would be…[indent][list][*]M = F÷(N×A) …or… [*]F = M×N×A[/list][/indent] I cannot make any good guess as to what the value of A might be, but perhaps if you were to contact the manufacturer of the adaptor, show them my math, perhaps they can provide this missing value. [/QUOTE]
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