Archived posting to the Leica Users Group, 2001/03/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I don't know whether I'd consider the tests at Photodo valid for a macro lens as the tests are done at infinity rather then close-up. On a macro lens I'd consider close-up focusing at smaller apertures more critical. An example is the Zeiss 120 Makro Planar. It tests lousy (compared to others) at infinity, however I'd consider its performance spectacular in close-up focus situations upto 1:1 (I haven't used it reversed with bellows which would take it to 1:2.58). andy - -----Original Message----- From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Jay Coleman S ... Leica lenses are designed for maximum resolution at maximum aperture and in fact often drop off by f8. This is born out by the scores of Leica lens at given apertures. The 100 APO has a 0.88 at f4 which is "perfect" per Photodo but drops off at f8.