Focussing with the 140mm Sonnar for C645

Discussion in 'Medium Format' started by colin_elliott, Sep 14, 2005.

  1. 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.
     
  2. 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
     

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