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<p>[QUOTE=&quot;dougsmit, post: 3781958, member: 19463&quot;]There was a time when the main advantage of macro lenses was freedom from distortion and color fringing.&nbsp; I worked with a 20x24 copy camera (took cut film that size or smaller) that belonged to my employer.&nbsp; The best lenses were termed apochromats and were color corrected for three colors rather than the usual two.&nbsp; These had very flat fields.&nbsp; They were not any sharper in the center but flat field is good.</p><p><br /></p><p>Today, those who shoot with &#039;real&#039; cameras in RAW mode have the option of software correction of camera distortions that still expect a good lens to start with for good results (no zooms, no super speed lenses, no tiny sensors).&nbsp; I have not played with the idea since I rarely use the corners of my images where there is anything to be gained.&nbsp; Coins have a great advantage over stamps when it comes to photography with regular lenses (sharper in the center and weak in the corners).&nbsp; We don&#039;t use the corners for our round subjects.&nbsp; Digital also allows easy assemblage of a fake &#039;tray&#039; image with each coin individually corrected and full resolution.&nbsp; You could make a high resolution &#039;tray&#039; image the size of your wall with cut and paste.&nbsp; I suspect the only real market now for super corrected glass is for binoculars and telescopes since the cost of these lenses is harder to justify in digital photography where software can fix problems.&nbsp; The easy answer now is to start with too many pixels and crop out the bad ones in the corners.[/QUOTE]</p><p><br /></p>

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