Sorry for the cut off title. Is there any optical difference between MC and MD versions ? I used to have no less than three separate copies of Minolta MD 50/1.7. All were great performers and felt very well balanced on my Nex. I also had a MC Rokkor 50/1.4 PF that I found stupidly cheap. And the SEL50. And at various times two or three different Maxxum AF 50/1.7. So I was awash in 50s even thought it's not a very useful FL on a crop. So last year I decided to get rid of my 50 mm primes and just keep one. That one was the 50/1.4, just because it was relatively harder to find. I also got rid of the SEL50. This was a dumb decision. I should've kept MD50/1.7. I didn't see any improvement from using the faster lens, it was heavier, and didn't seem to possess the same warm Minolta colors. So it too had to go. So, I decided to get another 50/1.7. The only one I was able to find that was clean and at a decent price was the MC 50/1.7 version (55mm diameter, I assume). How different is it from MD, especially optically ?