Since the tested lenses span a range of focal lengths, I just cropped similar areas out of each shot and present them here.

1) Point of focus. All lenses were focused manually and I tried to get the street signs at the lower left of the cropped area as sharp as possible, but they represent a very small area within the image so the exact point of focus may vary slightly between lenses.

2) Flare? Some of these lenses exhibit a great deal of flare or halation. This may be due to the cone of light projected by these lenses causing reflections within the Pentacon 6->Canon EOS adapter. I did install a baffles and flocked the interior of the adapter, but there could still be reflections that reduce contrast and produce strange halos.

3) Flektogon-Digital problem? I was really surprised by the results of the two Flektogons... so much so that I went back outside and re-shot them because I thought I'd made some horrible mistake the first time around. However, the re-shot images had the same look as the ones presented here. Honestly, I expected better of these lenses, and I don't recall getting such bad results on film. It could be a matter of how these lenses project their image and that the D-SLR sensor just doesn't like it. Or maybe they're just not very sharp lenses at all?

4) Representative sample. I am using my own equipment for these tests, some purchased new but other pieces purchased used. I do not know the history of the lenses I purchased used, and so some of them may have been disassembled or serviced prior to their coming into my possession. At any rate, the lenses tested here are assumed to be a "representative sample" of what is commonly available. Variations in manufacture among other things may skew the results, and so these test images may or may not accurately reflect what you can expect from a different lens specimen.