Originally posted by and say thats a question Id like to ask the nokton/ultron owners, how are the focusing rings ? compared to the 125. mr pirate should know that, youve tried them all havent you
I have quite a few, though I haven't tried the Ultron (too close to the 31 and 58 for me) or the Heliar (can't find one, but I'll have an 85 soon). I can say that the 58 is my favourite 'feel' wise including the Lanthars and the Zeiss T*25. The reason - it is smooth damped, helicoid like the others, but just right tension wise plus it has a rubberized layer over the focus ring. Grippy.
The tension on the 125, 58 and T*25 are all similarly smooth, though the 125 has the seperate silver metal ring while the T*25 features ridges that are integral to the barrel itself (as it appears is the case for all the Zeiss Z line). I prefer this design over the Lanthars - less that could go awry someday, as per the Photozone review (forget which model, but said the metal ring had come loose).
The 180
is stiff, as you say, but it hasn't prevented me from making the shots I ask of it, and it still feels significantly better to me than manual focusing even a high quality native auto-focus lens with the screw drive vibration (like the 31 for example). Also like you, I find myself rarely using anything to long, but the 180s close focus can extend its usefulness greatly.
Oh... the 90 is in-between the 180 and 125 for stiffness, its nice to focus. All these lenses spoil though, there isn't a 'bad' one among them.