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Thread: Lenses for circular pictures on 8x10

  1. #31
    ic-racer's Avatar
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    Re: Lenses for circular pictures on 8x10

    8" is about 200mm so look for lenses with image circle around 200mm. There is a chart here with most info you will need: http://www.largeformatphotography.info/lenseslist.html

  2. #32

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    Re: Lenses for circular pictures on 8x10

    Quote Originally Posted by ic-racer View Post
    8" is about 200mm so look for lenses with image circle around 200mm. There is a chart here with most info you will need: http://www.largeformatphotography.info/lenseslist.html
    That chart is an usefoul resource, but not for what OP would like. Those data are for objective focused at infinity. On the other hand with a bit of trigonometry, one can calculate image circle at any distance.
    Marko

  3. #33
    ic-racer's Avatar
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    Re: Lenses for circular pictures on 8x10

    Quote Originally Posted by Marko Trebusak View Post
    That chart is an usefoul resource, but not for what OP would like. Those data are for objective focused at infinity. On the other hand with a bit of trigonometry, one can calculate image circle at any distance.
    Marko
    Yes, or if he has his camera and a lens handy he can use simple math and divide his (bellows draw) by (focal length) and multiply that by (image circle at infinity) to find his effective image circle.

  4. #34
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Lenses for circular pictures on 8x10

    It's a linear relationship.

    The IC diameter at 1:1 (life-size image) is twice that at infinity focus.

    It also varies with aperture, getting smaller as the aperture gets larger (smaller f/number).
    The IC you find on lens datasheets is usually three stops down from wide open, i.e. f/16 for an f/5.6 lens.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

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