Front element focusing Tessar. A good thing?

Discussion in '35mm Cameras and Accessories' started by Hamster, Jun 5, 2009.

  1. Hamster

    Hamster Member

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    I have a Rollei 35 and I have notice that when focused to infinity, the FOV seems to be much wider then in the viewfinder.

    I understand that with front focusing tessar, the focal length changes with different distance, but is it by a significant amount? What about FOV?

    Is there a chart where I can see the FOV according the focus distance?

    I am about to do a series of long exposure night photo on 135 film. And am deciding between taking a Spotmatic with a 35mm lens or the little Rollei. If the FOV for the Rollei at infinity indeed approach that of the 35mm SLR lens, then perhaps I should just go for the Rollei for the mobility and lower level of vibration. Is this thinking sound, afterall at f8 all lenses are fairly similar?
     
  2. ic-racer

    ic-racer Member

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    At infinity it should be 40mm focal length with 57 degree angle of view. An SLR lens of 35mm focal length will have its widest angle of view at infinity also. You should compare them side-by-side and see if the extra view of a 35mm lens is what you want.
     
    Last edited by a moderator: Jun 5, 2009
  3. Rol_Lei Nut

    Rol_Lei Nut Member

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    Does the 35 have front element focusing?

    My Sonnar-equipped models don't (just checked to be sure)....
     
  4. Ian Grant

    Ian Grant Subscriber

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    The Tessar's and Triotar's are front cell (element) focusing, which is a compromise and won't be quite as sharp as a lens focussed as a complete unit, but they are far cheaper to make.

    This is what makes the Sonnar versions far more desirable.

    Ian
     
  5. dynachrome

    dynachrome Member

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    I have an original Rollei 35 from 1966 which was made in Germany and a later Rollei 35 which was made in Singapore. In general a unit focusing lens will be better than a front focusing lens. In the case of the Rollei 35 I don't think you will see a big difference because it doesn't have very close focusing. I have never used a Rollei 35 with the f/2.8 lens but the f/3.5 Tessars on my camera seem pretty good.
     
  6. Rol_Lei Nut

    Rol_Lei Nut Member

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    I've never used a Rollei 35 with a Tessar, only the Sonnar, but I wonder if in practice, at closer distances, the lack of a rangerfinder might negatively affect the image more than a front cell focusing lens.

    That's not to say I haven't had some extremely sharp (lucky?) closer-range images from it, I just wonder how much of a difference the front cell focusing makes.
     
  7. Hamster

    Hamster Member

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    I have just done some really good portrait photo at 0.9m, it was the only camera I had with me at the time but I pressed it into service.

    Very happy with the results and close ranger performance of the 40mm tessar. Don;t think front cell focusing limits it at all.