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35mm -> 70-210mm lens
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<blockquote data-quote="hark" data-source="post: 232491" data-attributes="member: 13196"><p>The conversion factor is a HUGE pain!!! From what you wrote here, I can see the wheels turning in your head! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>Whether you multiply or divide depends upon whether you are starting with DX or FX. </p><p></p><p>I see I need to clarify with more detail. I wrote:</p><p></p><p></p><p></p><p>In my head, I was thinking about what type of DX lens would equal 210mm. You are correct in that you start with 210 and divide by 1.5. Instead of doing it that way, I was thinking of the following equation:</p><p></p><p style="text-align: center"><span style="font-size: 15px">DX Focal Length x 1.5 = 210mm on FX</span></p><p></p><p>I just figured out the number quickly in my head, but you are absolutely correct in that you need to DIVIDE. </p><p></p><p>So you did it as:</p><p></p><p style="text-align: center"><span style="font-size: 15px">210mm FX lens divided by 1.5 = Focal Length on DX</span></p><p><span style="color: #000000"></span></p><p><span style="color: #000000">However, that said...I believe you really do understand the concept and are well on your way to figuring out the difference between DX and FX focal lengths! </span><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="hark, post: 232491, member: 13196"] The conversion factor is a HUGE pain!!! From what you wrote here, I can see the wheels turning in your head! :) Whether you multiply or divide depends upon whether you are starting with DX or FX. I see I need to clarify with more detail. I wrote: In my head, I was thinking about what type of DX lens would equal 210mm. You are correct in that you start with 210 and divide by 1.5. Instead of doing it that way, I was thinking of the following equation: [CENTER][SIZE=4]DX Focal Length x 1.5 = 210mm on FX[/SIZE][/CENTER] I just figured out the number quickly in my head, but you are absolutely correct in that you need to DIVIDE. So you did it as: [CENTER][SIZE=4]210mm FX lens divided by 1.5 = Focal Length on DX[/SIZE][/CENTER] [COLOR=#000000] However, that said...I believe you really do understand the concept and are well on your way to figuring out the difference between DX and FX focal lengths! [/COLOR];) [/QUOTE]
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35mm -> 70-210mm lens
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