</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (b.e.wilson @ Sep 15 2002, 05:08 AM)</td></tr><tr><td id='QUOTE'>... in general apo lenses perform better at macro distances than non-apo lenses because they are better corrected and suffer from less chromatic aberation (color fringing).
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I would beg to differ here. Apochromatic correction, like the correction of any aberration, is optimized for particular distances, or equivalently magnifications. That may make them good close up, or it may not. For example the Apo-Ronars are, IIRC, apo at 1:1, as you would expect for true symmetrical process lenses.

OTOH, the Apo-Sironars are designed for lower magnification work. The &#39;S&#39; type are optimized for 1:10, and the &#39;N&#39; type for 1:20 - again IIRC. Thus the Apo-Sironar S lenses make for better studio use, whereas the &#39;N&#39; lenses may well be better in the field. Certainly neither can be assumed to be good for macro work simply for being designated as Apo lenses - it all depends at what magnification they are apochromatically corrected.