SMC Pentax-M Macro 4 / 50mm
Tests: Please note that these tests were made with the means at hand, not in a "scientific" way. See here.
SMC Pentax Macro 4.0 /50mm given by Patrick Brossier on march 20th, 2010.
I again digged about in a photographer's boxes ... and found that 50mm macro lens mounted on a bellows.Worthy lens, but not very bright (there is a version opening to 2.8)
At maximum magnification 1:2
Tests: Obviously, it is not at mean distance that a macro lens should be tested. Yet the results are very good, with perfect uniformity throughout the field. Gives much contrast. The opening 32 should be avoided.