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  1. #11
    KennyMark's Avatar
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    Once when installing chimney pipe in a frame chimney chase of a cottage in the cedar forest in Michigan's UP, I had to spend about an hour up in the very top of said chase while others worked either below me or outside on the roof. After a short time, I noticed that there was a beautiful projected inverted image on one of the walls of this small area. Apparently there was a small nail hole near my head that let me experience the space as my private camera obscura. Serendipitous events are the best!

  2. #12

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    That's cool.

  3. #13
    Joe VanCleave's Avatar
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    Quote Originally Posted by wildbillbugman View Post
    Ground Glass,
    Here is a basic question that betrays my lack of experience with pinhole photography.
    If I use an 8x10 view camera, with a pinhole attached to the lens board, will I be able to see an image on ground glass" This assumes enough lighting.
    Bill
    I've had good luck using a second lens board with a viewing hole aperture. The viewing hole is much larger than the pinhole, maybe several millimeters across, depending on the camera's focal length. The idea is to get a bright enough image to compose by, while details in the image will be very soft you should still have enough detail to set your composition. Once set, just swap out the viewing hole lens board for the taking pinhole board.

    You can make your own lens boards from model aircraft plywood, rather than spending big bucks on factory made boards. Cut them to size, bevel the edges as needed and spray paint flat black.

    ~Joe

  4. #14
    Jim Jones's Avatar
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    Joe is right. Black mat board or foam core is even cheaper and easier to work with for such lens boards. A cheap lens with a focal length equal to the desired pinhole focal length can be mounted in an even larger hole for brighter framing.

  5. #15
    RalphLambrecht's Avatar
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    yes, as soon as your eyes are dark-adapted under the dark cloth
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  6. #16
    RalphLambrecht's Avatar
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    this worked for me upto holediameters equivalent to f/8
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  7. #17
    RalphLambrecht's Avatar
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    great idea! i use f/8 for composing ans f/180-256 for image taking.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  8. #18

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    Hello to all,
    Jim Jones brought to my attention the Hue Candela.com website, with its formula for determining pinhole diameter in micro pinholes up to x100. I did the calculations for X3 at 3 focal lengths,
    Please look at the 2 attachments and give me your opinions/advise
    Bill
    Attached Files

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