pinhole size

Discussion in 'Pinhole Photography' started by TZuboff, Dec 19, 2003.

  1. TZuboff

    TZuboff Member

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    UK needles come in number like for example 3/9 or so, pinhole size tables come in mm. Who knows which numbers correspond to which mm sizes?
    Tatjana[/url]
     
  2. Aurore

    Aurore Member

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  3. Rlibersky

    Rlibersky Member

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    Alright I've search some, but this site is getting hard to read all the posts. Good news for Apug hard to search.

    I'm looking for information on the optimum pinhole size for said distance from film plane.

    Mainly 13, 14, 15, 16, 17, 18, 19 inches. Or is there a best fstop size. then I could figure out the hole size. I'm picking up my homemade 9.5x20 pinhole camera tomorrow. Can't wait to give it a try this weekend.
     
  4. PhotoPete

    PhotoPete Member

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    Try:
    http://www.wandascott.com/howtomake2.html
    or
    http://www.stanford.edu/~cpatton/pinholemath.htm
    or
    http://www.photo.net/pinhole/pinhole
     
  5. tpersin

    tpersin Member

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    Here's a great online pinhole camera calculator to help you figure out optimal pinhole size"
    http://www.mrpinhole.com/calcpinh.php

    here are needle numbers converted to mm:
    4, .90mm
    5, .80mm
    6, .73mm
    7, .66mm
    8, .58mm
    9, .51mm
    10, .46mm
    11, .40mm
    12, .35mm
    13, .33mm
    14, .30mm
    16, .25mm

    if you're looking for more info, may i suggest the f295 pinhole forum:
    http://f295.tompersinger.com


    cheers!
    Tom
     
  6. Rlibersky

    Rlibersky Member

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    Thanks, this should be a good start
     
  7. Donald Qualls

    Donald Qualls Member

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    FWIW, I use the same needle for all my pinholes, from .15 mm up to about .55 mm so far. Since all the holes are smaller than the needle shaft, I just have to control how deeply I let the needle penetrate.

    What I do is make a dimple that just penetrates, then sand off the dimple with a very fine whetstone (nice and flat, stays put, and I can use it with oil if I'm so inclined); measure (eyeball, if it's not close yet) and repeat as needed. I can usually make a hole within .001" (about .025 mm) of the desired size on the first or second try, and the resulting holes are perfectly round, burr free, and have a razor-thin edge. They aren't quite as clean as a Lenox Laser hole, but they're about $18 cheaper...

    I use .001" thick brass shim stock, but you could just as easily use the thin aluminum from the side of a beverage can...