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<p>[QUOTE=&quot;rmpsrpms, post: 2535915, member: 31773&quot;]I believe this lens was designed for transferring 16mm to 35mm in reverse (2:1 magnification), or 70mm to 35mm forward (1:2 magnification). Both cases involve the target to be 35mm, full-frame, so I would expect excellent performance on full-frame sensors, though I can&#039;t test this as I don&#039;t own a FF camera. Eventually I will buy one, and then a whole new round of lens testing will occur to find those lenses that have adequate coverage for the larger sensor!</p><p><br /></p><p>Regarding subject size vs focal length vs working distance, this all depends on your minimum bellows extension. Every new combo of focal length, minimum extension, working distance, magnification/subject size, etc is unique, and I find the limitations are often counter-intuitive. They of course make sense after I see the result, but prediction is not easy....I suppose this is a long-winded way to say &quot;you&#039;ll need to try it yourself&quot;...Ray[/QUOTE]</p><p><br /></p>

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