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  1. #1
    Willie Jan's Avatar
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    Pinhole and Hasselblad body

    I bought a Body dop and first made a hole of about .45mm. Images look blurry.
    Next I made one with a .3mm hole and they look much better...

    I made the hole first with a needle after that finished the hole with a .3mm drill and after that polished it with sandpaper to remove any edges. There are lasercut pinhole for sale on ebay, but would they increase quality that much?

  2. #2
    Sirius Glass's Avatar
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    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  3. #3
    Jim Jones's Avatar
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    I second Steve's suggestion of http://www.pinhole.cz/en/pinholedesigner/]. A user constant of about 1.4 or 1.5 provides maximim central sharpness. http://www.f295.org/ is another source with much information on pinhole photography.

  4. #4

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    After determining the proper needle size, I hold the needle and spin the shim stock around it, then finish with sandpaper. Look at it under a strong loupe and back lit to verify no burs and roundness. With the correct size, it will be very sharp. I have never tried it, but have heard of people using arcing electricity to burn a pinhole in to the shim stock. Not sure how you would control the size, but it sounded interesting.

  5. #5
    DWThomas's Avatar
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    I use the dimple and sand method wherein you don't necessarily pierce the shimstock with the needle, but raise a "pimple" and sand it using fine (400 or 600 grit), wet-or-dry sand paper. I sand wet with a gentle circular motion. I think my most recent pinhole, made for WPPD last April, was my best yet. It may have been helped by using 1 mil brass shimstock instead of my usual 2 mil. The thinner stuff is a bit harder to keep flat and not damage it, but since the ideal pinhole has a knife edge, the thin stock gets closer to the ideal automatically. Roundness, and an absolute minimum of edge upsets - tears, etc. is necessary for really good results. This year's pinhole camera was a 4x5, it does seem that larger formats produce sharper images.

    I used a .014 inch (0.36 mm) pinhole for a body cap adapter for my Bronica SQ-A (poor man's Hasselblad! )a few years back. The pinhole to film distance was about 90 mm.

    DaveT

  6. #6
    Willie Jan's Avatar
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    Steve,
    I liked the link where he measures the hole size with the enlarger. That's a good solution!
    http://www.pinhole.cz/en/pinholecameras/pinhole_01.html

  7. #7

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    Earl Jones [earlj] at f295.org also sells pinholes (made for electron microscope) of various sizes for a dollar a piece I guess.. he had run an advertisement in that forum as well.. can save you some troubles..



 

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