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  1. #61
    Mustafa Umut Sarac's Avatar
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    Chris ,

    For xray satellite telescope , Nasa uses pinhole. You can use pinhole as enlarger lens for uv.

    Umut

  2. #62
    holmburgers's Avatar
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    Quote Originally Posted by Mustafa Umut Sarac View Post
    Chris ,

    For xray satellite telescope , Nasa uses pinhole. You can use pinhole as enlarger lens for uv.

    Umut
    Ahh, a perfect solution in theory!

    Would the pinhole increase my exposure times beyond that of glass lens though?? And that's to say nothing of resolution.

    But, in a game of chess, that answer is a CHECK!

  3. #63
    Mustafa Umut Sarac's Avatar
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    Chris ,

    Let me see the King.

    You can read USAF Anderson , pinhole sieve lenses. They are higher resolution , lower f factor ,
    you use circular placed multiple pinholes. You can create a big one from your printer to the transparent film.

    There is no end at walkie talkie , you can print oval pinholes to the transparent film and even more increase the quality.

    Even you can create your real pinhole sieve lens with contact print on gum and opening holes.

    Umut

  4. #64
    Hexavalent's Avatar
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    There's a good reason why 'pinholes' are used for x-ray: "glass" doesn't work - there are few alternatices.
    - Ian

  5. #65
    holmburgers's Avatar
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    Realistically, I don't think a pinhole is going to be an option. I like the idea though.

  6. #66
    Mustafa Umut Sarac's Avatar
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    I think You are preparing your check for 20 000 dollar ELCAN. I would be happy to see you in welcoming to Leica family.

  7. #67
    Photo Engineer's Avatar
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    Early RC papers would crack under prolonged exposure to UV light. This is no longer the case.

    PE

  8. #68
    holmburgers's Avatar
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    Ahh, sounds good. The book is from the early 80's so perhaps this has been remedied?

  9. #69
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    The RC problem was pretty much remedied in the late 60s. Ektacolor 20 and Ektacolor 70 paper were two of the first Kodak products to use the new 504C support with antioxidants and UV protectors. There have been continual improvements since then.

    PE

  10. #70
    holmburgers's Avatar
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    Well then can you figure why Nadeau would say that RC papers aren't archival?



 

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