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  1. #1
    DimDim's Avatar
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    Using Polaroid Image film

    I plan to make a pinhole camera for pinhole day on sunday and would like to use some Polaroid Image cartridges that I found in my darkroom.
    Those are 640 asa which will come in handy as the kids will have to pose .

    Can someone give me an indication of the focal length that I need to use to make it wide angle? An aproximate pinhole diameter would also be welcome.

    I have this hole filter set from Monochrom at my disposal:
    http://www.monochrom.com/cc/monoc/sh...rtnum=00004765

    Thanks,

    Stefan

  2. #2

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    Here are some sites with lots pinhole information

    http://www.pinholeresource.com
    http://www.f295.org/site/
    http://www.pinholeedun.com/Welcome.html

    An online pinhole calculator can be found here; http://www.mrpinhole.com/

    Depending on the size of the film carts you are using, you would want an effective focal length of 50 - 60 mm most likely. In simple terms, the measurment of the film's diagonal would give you the approximate "normal" focal length. Anything less will be wide angle.
    A 60 mm FL would be a 0.327 mm hole, according to the above calculator.

  3. #3

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    Good morning Stefan,
    Normal for that film is 118mm focal length using approx .46mm hole. One half normal for a wide angle would be a 60mm with a .34mm hole at f191. I think you could go as wide easily to 40mm with a .267mm hole at f150. Pinhole numbers are very flexible, so for fun don't get stressed about a exact sized hole.
    Have fun,
    Sam H.

  4. #4
    DimDim's Avatar
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    Thanks already, and good afternoon here.

    At the Edun site I found the diameter list of my pinholes set because I erased one of the indications.
    Then by using Pinhole Designer ( http://www.pinhole.cz/en/pinholedesigner/ ) and a calculator I converted them to millimeters and made a little excel sheet with the focal lengths, f nrs and EV's for all 12 holes.

    Over now to cardboard and duct tape...



 

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