Upload & Sell: Off
Anyway, these ordered lists are obviously quite subjective. One thing I noticed with the Rokkor 58/1.2 is that the filter ring looks like it's very thin and soft as butter (the ones that have been bent are _really_ bent).
the filter ring isn't thinner than normal for a fast fifty of that era, but it is longer than normal in order to keep the large curvature of the front element from conflicting with filters. i've often wondered if they purposely didn't reinforce it more so that it would bend and absorb the shock of impact from a drop. the high weight of the lens will easily bend it if dropped from waist level. having said that i would have no fear for the optics or movements being damaged by dropping the lens, while if i dropped my c/y 35/1.4 i doubt the filter ring would bend as easily, but would be very worried about ruining the helicoid or knocking elements out of alignment (having disassembled both lenses).
I never pinch my focus rings during normal use. I don't see when/how you would even notice that except when deliberately testing the rigidity of the construction while turning the focus ring... Also, I can't pinch my Makro-Planar 100/2.8 and stop the ring from moving; maybe if use a lot of force but I'm not going to try that.
i've done it accidentally with some of the smaller lenses, perhaps i squeeze abnormally hard.
W.r.t. to older lenses such as Super Taks and Nikkors having higher quality parts -- too bad they don't come with Zeiss optics inside them, then they'd be interesting to me.
indeed, when i have more time i want to stick a few of my zeiss optics into modified rokkor bodies.
The aperture stops are crisp on all my Contaxes and the focus rings are pretty smooth and consistent (esp. on my 50/1.4). I can believe that there is variation among copies though, depending on how much abuse they've received, so their build is definitely not perfect, but IMO that is reflected in their price.
i'm sure when they're new and very well maintained the mechanics function well. i'm just shocked how many of the used ones i run into seem to have issues, especially when the same issues seem much less frequent in 10-30 year older lenses that have obviously seen a lot more wear.