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<blockquote data-quote="WayneF" data-source="post: 235123" data-attributes="member: 12496">There are two ways to do it.Use a focal length 1.5x longer on DX than on FX.&nbsp;&nbsp; For example, 35mm on DX or (35 x 1.5 = ) 52mm on FX would show the same view if standing in the same location.&nbsp; The DX frame is just cropped smaller, so it needs a wider lens to compensate.Or with the SAME lens,&nbsp; you can back away, and stand 1.5x further with the same lens on DX as&nbsp; is also on FX.&nbsp; The views will be the same (but perspective could be&nbsp; slightly different).&nbsp; It is the same lens then, which does the same&nbsp; thing, but the DX frame is just cropped smaller, so it needs to stand&nbsp; back farther to compensate.Normally, the concern is not so much to make them equal as to use their advantages.With a similar lens, then:The DX shows a 1.5x longer telephoto view, considered good for sports or wildlife.The FX shows a 1.5x wider view, the only way to get real wide angle.The only factor is that the DX sensor simply sees a smaller cropped area than the larger FX sensor sees.See <a href="http://wwws.scantips.com/lights/cropfactor.html" target="_blank">FX - DX Lens Crop Factor</a></blockquote>

[QUOTE="WayneF, post: 235123, member: 12496"] There are two ways to do it. Use a focal length 1.5x longer on DX than on FX. For example, 35mm on DX or (35 x 1.5 = ) 52mm on FX would show the same view[B] if standing in the same location[/B]. The DX frame is just cropped smaller, so it needs a wider lens to compensate. [B]Or with the SAME lens[/B], you can back away, and stand 1.5x further with the same lens on DX as is also on FX. The views will be the same (but perspective could be slightly different). It is the same lens then, which does the same thing, but the DX frame is just cropped smaller, so it needs to stand back farther to compensate. Normally, the concern is not so much to make them equal as to use their advantages. With a similar lens, then: The DX shows a 1.5x longer telephoto view, considered good for sports or wildlife. The FX shows a 1.5x wider view, the only way to get real wide angle. The only factor is that the DX sensor simply sees a smaller cropped area than the larger FX sensor sees. See [URL="http://wwws.scantips.com/lights/cropfactor.html"]FX - DX Lens Crop Factor[/URL] [/QUOTE]

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