WTB:Process lens, (Germinar, Tessar, Ronar, Saphir, RDA, Cooke, 30" to 72 inch UULF

Discussion in '[Classifieds] Want to Buy' started by Asher Kelman, Jul 24, 2011.

  1. Asher Kelman

    Asher Kelman Member

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    I'm looking for lenses for my walk in camera obscura. So please let me know what you have available.

    I have so far a 760 app Nikkor

    a 1000 mm Zeiss Germinar, if it will arrive!!

    now looking for longer lenses!

    PM or email to editor.opfATmac.com

    Asher
     
  2. Asher Kelman

    Asher Kelman Member

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    If you don't have a process lens, then an XXL would do too, LOL!

    Come on, go through your boxes and drawers. Where's the wide coverage/huge monster lens you bought for a project long forgotten?

    Asher
     
  3. Asher Kelman

    Asher Kelman Member

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    Still looking! What about 70 inch or 72"
     
  4. Asher Kelman

    Asher Kelman Member

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    Maybe you have a cooke process lens or a Wray from the U.K.

    Thanks for looking?
     
  5. Greg Davis

    Greg Davis Member

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    I have a brass barrel 48 inch APO Artar that is missing the aperture blades. I had intended to have it mounted in a shutter, but I will never use this lens for anything. If you are interested, make an offer.
     
  6. Jim Jones

    Jim Jones Subscriber

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    A 1/4 or 1/2 diopter close-up adaptor lens with an appropriately placed aperture might provide a bright enough image for some applications.
     
  7. Asher Kelman

    Asher Kelman Member

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    Jim,

    Are you saying to use alone? I already thought of using one with a process lens to decrease the required distance to the subject!

    Asher
     
  8. ausphoto

    ausphoto Member

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    I have a Cooke Apochromatic 25-inch ... is that too small for your needs?
     
  9. Asher Kelman

    Asher Kelman Member

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    Thanks PM sent!
     
  10. Maris

    Maris Member

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    I have set up several walk-in camera obscura rooms by blocking a window and inserting very long focal length lens in the opaque window screen.

    Making a long focal length lens is easy and cheap and the image quality is ok because the large focal ratio minimises aberrations. I get two spectacle lenses, say +3 and -3 dioptre, from my local optometrist at about $20 each. When held together the powers cancel and the focal length is infinite. When separated, positive converging power (adjustable!) appears according to the distance between the lenses. The mathematical basis is given in Gullstrand's Equation.
     
  11. Asher Kelman

    Asher Kelman Member

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    Great instructions; will do! I had already ordered a + 1 diopter to play with bringing in the lens to subject distance!

    Asher
     
  12. Asher Kelman

    Asher Kelman Member

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    Greg,

    could you send a picture to editor.opfATmac.com

    Thanks!
     
  13. Asher Kelman

    Asher Kelman Member

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    Have enough at 750mm 760 mm 47.5 /48mm

    Still interested in other focal lengths.