Hello there, I am excited to try one of these lenses with an adapter on my Digital SLR, the only thing is that I can find a few different models on ebay and can't make my choice... There are the PRESET series (16blades iris) and the MULTICOATED (MC) that is a more recent version I guess, but 8 blades... I also found another version from poland that looks really vintage but I don't know which one is the sharpest and cleanest at maximum aperture! any Ideas? thanks!