Focussing with the 140mm Sonnar for C645

I have recently acquired a used but "mint" Sonnar 140mm for my

Contax 645.

When I manually turn the focussing helicoid in either direction past

minimum or maximum focus(inadvertently), there is little resistance.

My 2 other lenses, 45 Distagon and 80 Planar, purchased new, have a

fair amount of "drag" or resistance when attempting this. I don't do

this often, but with the 140, it is very easy to go past these "ends"

Do others who have this lens find the same thing, or is mine showing

a problem? The resulting pictures are typical Zeiss and I have

abolutely no compaints; it performs flawlessly.Is there some sort of

clutch mechanism that should be adjusted?

Thanks.

Colin,

I don't know if you have a problem. I own the same three lenses and all have the same resistance when you go past the end of the focusing range. I would say that as long as it focuses accurately, you shouldn't worry about it.

Take care,

Tom