Pinhole problems

Discussion in 'Pinhole Photography' started by Thumb, Feb 7, 2012.

  1. Thumb

    Thumb Member

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  2. edp

    edp Member

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  3. gtyler5

    gtyler5 Member

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    Looks like pinhole images to me. What kind of results are you looking to get? Is your camera home made?
     
  4. Thumb

    Thumb Member

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    So, some light leaks..yeah..it's possible :smile:
    Yes, it's 35mm. It's Fomapan 100 (maybe 200) And do you think, that the distance between ,,lens'' and film is ok?
     
  5. Thumb

    Thumb Member

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  6. himself

    himself Member

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    could be, how did you calculate it?
    and for all your pinhole needs try MrPinhole
     
  7. Thumb

    Thumb Member

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    I did it by Pinhole designer
     
  8. edp

    edp Member

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    Those ones you linked to I would say are i) wider than yours (shorter distance between pinhole and film), ii) at least medium format, and iii) the black and white ones use a curved film plane.
     
  9. himself

    himself Member

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    did you machine the pinhole yourself?
    looking at the links you posted they were probably super high quality holes, not using a pin by hand or something
     
  10. edp

    edp Member

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    I completely recommend Fuji Acros 100 for pinhole: excellent reciprocity characteristics, and very little grain.
     
  11. DWThomas

    DWThomas Subscriber

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    Based on only moderate light fall-off near the ends, I'd say your pinhole to film spacing is probably OK. Several of the images appear to show camera motion during exposure; a solid way to anchor it would be good. I actually have a tripod socket (a 1/4-20 threaded "T-nut") in my most recent one. As others have said, there appears to be some light leaks too.

    I didn't dig through that other site enough to learn what film format the guy was using. Generally from what I have seen, the larger the film format, the sharper the image. But sharpness can also be very much affected by the quality of the pinhole, as well as the size. A perfectly round hole with a knife edge in very thin material produces the best result.

    You certainly got some recognizable results, it was a good attempt.

    DaveT
     
  12. Thumb

    Thumb Member

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  13. Thumb

    Thumb Member

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    Thanks very much
     
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  15. himself

    himself Member

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    not so sure about the film size, 35 has always worked fine for me.
    but you're right about the rest, pinhole quality is probably most important.
     
  16. Thumb

    Thumb Member

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    yes i did it by myself.
     
  17. himself

    himself Member

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    what did you make it in and with?
     
  18. Thumb

    Thumb Member

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    Thank you so much. It's useful for me. I'm beginner
     
  19. edp

    edp Member

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    How big did Pinhole Designer tell you to make the hole? How did you make it? You can get a good idea of how big, and how round, the hole is by using a scanner.

    Don't ban me for saying sc*nner.
     
  20. cliveh

    cliveh Subscriber

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    This looks to me like camera movement.
     
  21. DWThomas

    DWThomas Subscriber

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    I just realized -- the examples you linked to are taken by the creator of Pinhole Designer, he has a head start on some of the rest of us!

    You can survey a few of my pinhole efforts on my PBase gallery site. The film images I took for WPPD 2011 (with a completely homemade 4x5) suggest it's my best homemade pinhole yet. My attempts with paper negatives indicate a little more tweaking, especially an adjustment of the pre-flashing, might be useful.

    So far, a body cap adapter for my Bronica, getting 6x6 cm format exposures, is the smallest format I've tried, so I don't have much feel for what 35 mm might do. I second the recommendation for Acros, as there are enough complications without adding large reciprocity failures.
     
  22. edp

    edp Member

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    My best results are all 6x9cm, using a Zero Image camera which has a pinhole somewhat smaller than the recommended values calculated by pinhole designer. That makes the images a bit sharper, and the reduced enlargement from the film to the viewing size also helps it to appear sharper. Although, sharpness is not what pinholery is about. http://www.flickr.com/photos/9295972@N02/sets/72157605483356905/
     
  23. Thumb

    Thumb Member

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    At first, I make a hole by needle to the piece of thin alluminium. I measure it by scanner. It was 0.25mm .Pinhole designer said to me, that distance between hole and film should be 31,478mm.
    The whole Pinhole was made from cardboard and from black tape.
    http://monet.rajce.idnes.cz/Pinhole#DSC00567.jpg
     
  24. edp

    edp Member

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    Nice camera.

    I would try to make another hole, this time a bit smaller, say 0.18 or 0.20mm. I've had some success using small pieces of beer can, and using the method where you first press a small dent into the metal, then sand it away from the other side using very fine sandpaper or a knife sharpening stone. It's easier to control the final size that way than it is by simply pushing the needle through the foil.
     
  25. cliveh

    cliveh Subscriber

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    Try this for size - http://www.make-a-print.com/section462733.html
     
  26. Thumb

    Thumb Member

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    Ok, i'll try it.. Should I try 120mm film?