I must admit to only sharing one of them - the Zenit Helios 40-2 85/1.5 (early edition) - I was lucky to pay through the nose for a new old stock version which arrived in immaculate condition reeking of lathe oil. Unfortunately the focus action was very stiff. But after a while I summoned up courage and re-greased it after which the focus was as smooth as silk.
The Helios 0-2 85mm 1:1.5 versions seem to have the same problem: focus getting stiff over time. Two have copies. The newer version had a completely fixed focus ring which was sold to someone who can fix it, while I currently have the older version that is difficult to focus although it is not possible to use. I do not have time and am willing to fix it, as I am using the CZJ Pancolar 80mm 1:1.8 instead.
But you also reminded me of my CZJ Sonnar 200mm f2.8 which I think is fairly rare (S/N says "0741") which is a significant lump of heavy metal - also in M42 and seemed hardly used if at all when it arrived.
Actually I meant the 180mm 1:2.8 rather than the 200mm 1:2.8. Unfortunately, the 200mm 1:2.8, which I have had a copy for more than a decade, shares the same problem as the 40-2 85mm 1:1.5. Many Soviet era lenses have essentially the same problem, perhaps due to QC.
This must be the overweight big brother to your CZJ Sonar 180/2.8
That is right. So, they are good paper weights as well. I would prefer the Nikon 180mm 1:2.8 AF or even the Tamron 180mm 1:2.5. Some people insisted the Tamron is better than the last MF version of the Nikon. Sharper may be, but in terms of rendering I would prefer the Nikon.
The NEEWER E-to-Z AF adapter may not work well with some of my AF E lenses, but the 100mm 2:8 STF did work in AF. However, the actual maximum aperture is T5.6 and the final effect may not be as good as the Nikon AFS 105mm 1:1.4.
My next project would be putting a Sigma MC11 (Canon EF-to-Sony E) AF adapter in front this NEEWER E-to-Z so that I could try my very limited number of EF lenses. At least, the monster Sigma 50-100mm 1:1.8 for Canon works; but I could only try it on a Nikon Z50. Isn't it a waste? I don't know. Maybe I should find a cheap Canon EF 200mm 1:1.8,
CK