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  1. #1

    Join Date
    Sep 2007
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    WTB:Process lens, (Germinar, Tessar, Ronar, Saphir, RDA, Cooke, 30" to 72 inch UULF

    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. #2

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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. #3

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    Still looking! What about 70 inch or 72"

  4. #4

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

    Thanks for looking?

  5. #5
    Greg Davis's Avatar
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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.
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

  6. #6
    Jim Jones's Avatar
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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. #7

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    Quote Originally Posted by Jim Jones View Post
    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.
    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. #8
    ausphoto's Avatar
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    Jun 2010
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    I have a Cooke Apochromatic 25-inch ... is that too small for your needs?

  9. #9

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    Thanks PM sent!

  10. #10
    Maris's Avatar
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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.
    Photography, the word itself, invented and defined by its author Sir John.F.W.Herschel, 14 March 1839 at the Royal Society, Somerset House, London. Quote "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..". unquote.

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