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Thread: APO Symmar 150mm - Aperture blades never fully open

  1. #1

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    APO Symmar 150mm - Aperture blades never fully open

    Hi!

    I just got an APO Symmar 150mm in a Compur 0 shutter.
    I have been checking the lens and realized that at f/5.6 it never gets wide open, I can still see the blades from the lens, they are out about 2mm on each side. The aperture never gets completely circular, it has curved edges.

    Is that normal? does the lens aperture is actually less because of this?

    Ignacio
    Attached Thumbnails Attached Thumbnails IMG_9505.jpg  

  2. #2
    Corran's Avatar
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    Re: APO Symmar 150mm - Aperture blades never fully open

    Definitely not normal, at least in the Copal shutter mine is in. Perhaps you can post more photos and someone else can chime in about a Compur-mounted one.
    Bryan | Blog | YouTube | Instagram
    All comments and thoughtful critique welcome

  3. #3

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    Re: APO Symmar 150mm - Aperture blades never fully open

    An Apo Symmar seems a bit new for a Compur. Do you know if that's the original shutter for those cells? Sometimes shutter aperture openings are matched to the exit pupil size of the lenses they were sold with.
    Trevor

  4. #4
    Myriophyllum's Avatar
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    Re: APO Symmar 150mm - Aperture blades never fully open

    Quote Originally Posted by CatSplat View Post
    An Apo Symmar seems a bit new for a Compur. Do you know if that's the original shutter for those cells? Sometimes shutter aperture openings are matched to the exit pupil size of the lenses they were sold with.
    Hi,

    Apo-Symmar was sold in the latest version (the black one) of Compur in the 1990s. A very good shutter...
    The 150mm came in Copal 0, Prontor Prof. 01S or Compur 0.
    My Compur 0 fully opens (but a Grandagon-N 4.5/75mm here).

    Best
    Jens

  5. #5

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    Re: APO Symmar 150mm - Aperture blades never fully open

    Quote Originally Posted by Myriophyllum View Post
    Hi,

    Apo-Symmar was sold in the latest version (the black one) of Compur in the 1990s. A very good shutter...
    The 150mm came in Copal 0, Prontor Prof. 01S or Compur 0.
    My Compur 0 fully opens (but a Grandagon-N 4.5/75mm here).

    Best
    Jens
    Good to know, thanks. The Compur for my older 65mm/5.6 Super Angulon only opens as wide as the lens pupil, which is quite small.
    Trevor

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