ni_gentry Posted January 27, 2007 Share Posted January 27, 2007 Question for you techies...<p>Which lens will give the highest magnification factor when used with a Nikon 6T close up filter... the Canon 50mm f/1.4 or 85mm f/1.8 ?<p>I'll also ask the same question but using the Canon 500D filter (which I do not own) instead of the Nikon 6T (which I do own). I know the 6T has a higher diopter.<p>Does this look right?<p>Nikon 6T, diopter 2.9 ---> focal length 345mm<br>magnification ~= .15 on a 50mm lens<br>magnification ~= .25 on an 85mm<p> Canon 500D, diopter 2.0 ---> focal length 500mm<br>magnification ~= .10 on a 50mm lens<br>magnification ~= .17 on an 85mm<p> Link to comment Share on other sites More sharing options...
robin_sibson1 Posted January 27, 2007 Share Posted January 27, 2007 Yes, at that level of precision. That's with the lenses focused at infinity, of course. At closest focus you have to factor in both different native near-focus capability and the fact that the 50/1.4 is linear-focusing (maintaining focal length) whereas the 85/1.8 is internal-focusing (reducing focal length). Exercise for the reader. Link to comment Share on other sites More sharing options...
jcolwell Posted January 27, 2007 Share Posted January 27, 2007 It sounds as if you need a <a href="http://www.imaginatorium.org/stuff/cufilter.htm">close-up filter calculator</a>. For a subject at the same distance, the 80mm will give higher mag, but you might not get the 50mm and 80mm lenses to focus at the same distance. I keep a 500D in my small waist bag (along with a CP filter, lens/body cap, CF cards, pen, paper & business cards) for use on my 70-200/2.8 L IS when I don't happen to have a true macro lens with me. It works well, but the subject distance at which it can focus is only from about 10" to 20". Link to comment Share on other sites More sharing options...
eosdoc Posted January 28, 2007 Share Posted January 28, 2007 A better calculator that can handle Close-up diopters, extension tubes, and teleconverters.<BR> <a target=loser href= http://eosdoc.com/manuals?q=jlcalc >http://eosdoc.com/manuals?q=jlcalc</a> Link to comment Share on other sites More sharing options...
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