Hi Joe,
The M-Rokkors work very well with all sorts of film -- mine is the later CLE version and it matches the high resolution and accurate color rendition of my M-Rokkor 40/2. I have no experience with the earlier Summicron-C lenses but lots of people here do. I guess I'd say the M-Rokkor poses no impediment to good photos.
Great, thanks. From what I've read, I think there is little difference contrast/color-wise between the Summicron-C 40 and the later CLE Rokkor 40, so I'm sure a Rokkor 90 would be a good partner for my Summicron 40.
My personal feeling is that the fondlers and people who live and die by the spec sheets horribly overplay the idea of high- and low-contrast lenses, and probably don't know how to control contrast with film selection, lighting and filtration
I think that's partly true, but when I'm out for a day's shooting and my cameras are loaded I don't really have the possibility of changing films when the light changes, and there's not much filtration I can do with colour films.
Also, if I'm out with, say, one camera and a couple of lenses, and a film chosen to suit the conditions, it really helps if the two lenses are similar in contrast rendition (eg a Summicron/Rokkor 40/90 combination).
Yes, there are high- and low-contrast lenses, just as there are sharp and soft ones. But it's rarely so dominant as to be a limitation.
I would have to disagree with that, I think, because I've found huge differences in the contrast of different lenses - only recently I did some comparisons of several 50s (I must get round to posting the results here), and the difference in contrast between my three main ones really is very significant.
A well-designed lens plays it down the middle.
Again, I think I disagree. I don't think there's anything about the designation "well designed" that implies middling contrast - I have lenses that have high overall contrast, and I have lenses with low overall contrast but beautiful mid-tone rendition, and I think it is simply wrong to suggest that is "bad design".