Home made ULF camera

Discussion in 'Ultra Large Format Cameras and Accessories' started by Mainecoonmaniac, Feb 13, 2013.

  1. Mainecoonmaniac

    Mainecoonmaniac Subscriber

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  2. Jesper

    Jesper Subscriber

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    Nice camera. Congratulations.
    I'm building a 16x20 as well and it is almost finished (a little paint and velvet and it is ready).
    Good luck with your pictures.
     
  3. Mainecoonmaniac

    Mainecoonmaniac Subscriber

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    Wow. What lens are you using to cover a 16x20 piece of film?
     
  4. johnielvis

    johnielvis Member

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    nice...what's all the metal hardware things sticking out at regular intervals? some kind of rod system for locking the standards to gether?
     
  5. PanaDP

    PanaDP Member

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    Those are bulldog clips. I guess the photos were taken during a dry fit up before the bellows were permanently attached to the standards.
     
  6. auntipode

    auntipode Member

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    Negative diopter?

    I'm curious. As it isn't in the build photos, did you attach it to the back of the lens or to the front like a typical filter? Also, where did you find a negative diopter lens of such a diameter?
     
  7. johnielvis

    johnielvis Member

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    back of lens is best--it works only to increase the focal length, and, in turn, effective coverage of the lens. Of course it degrades quality, but when you have huge plate to cover, it works. You can get negative diopters from optician or trial lens sets these days. Maybe surplus shed or the like, optical supply houses.

    The teleconverter lenses work on the same principle. They are a negative diopter, diverging lens, that increases focal length. Since the angle of coverage remains the same, the extra distance between the lens and the film plane due to the increased focal length, makes the coverage circle bigger.
     
  8. auntipode

    auntipode Member

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    Negative diopter

    Thanks. I've ordered a couple of negative f.l. meniscus lenses to experiment.
     
  9. johnielvis

    johnielvis Member

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    oh good--post the results if possible--it'd be interesting to see what you get out of it. Don't get discouraged if the edges turn mushy with meniscus lenses--they will--a simple negative diopter is not a fully corrected teleconverter. But it may do the job for you. it all depends on what you like.
     
  10. FoidPoosening

    FoidPoosening Member

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    Really interesting tumblr. The image with the binoculars and map is incredible. Thanks for sharing! :smile: