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Thread: Super Angulon 90mm f8 fstop scale off kilter

  1. #11
    Jim Jones's Avatar
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    Re: Super Angulon 90mm f8 fstop scale off kilter

    Shutters are manufactured to accommodate different lenses. Most 90mm f/8 lenses don't require as large a maximum aperture as these shutters. There's no real need to block the shutter from opening more than enough for whatever lens is installed in the shutter. You can easily check the aperture scale by measuring the apparent diameter of the aperture opening as seen through the front lens cell. Don't get your eye really close to the lens while doing this to avoid a parallax error. The apparent diameter of the aperture should be 11.25mm at f/8. An error of a millimeter or so will cause little exposure error.

  2. #12

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    Re: Super Angulon 90mm f8 fstop scale off kilter

    Thanks, Jim. I measured the apparent diameter of the pentagon - from one long point to it's opposite side - and it's right on the money for 90/8. Thanks a lot for your suggestion.

  3. #13

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    Re: Super Angulon 90mm f8 fstop scale off kilter

    Quote Originally Posted by rachjak View Post
    Attachment 173044

    Scale pointer at far right in photo, well beyond f8. This where the aperature is wide open. Moving it back to f8 stops the lens down slightly. Thanks a lot for the input.
    The pointer looks slightly bent to me.

  4. #14
    ic-racer's Avatar
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    Re: Super Angulon 90mm f8 fstop scale off kilter

    Other than the little bend that was observed by xkaes, the aperture scale looks the same as other correct 90/8 examples I have seen or used.
    Here is an example of obviously incorrect scale for that lens:

    Click image for larger version. 

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