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 Another problem with oatmeal-pinhole photos		  New Topic  Reply to Topic
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madmolecule
Newbie

USA
1 Posts
Posted - 08/05/2006 :  04:51:25  Show Profile  Reply with Quote
My wife and I made an oatmeal-box pinhole camera this weekend as a lark. After some experimentation with exposure times, we started getting some images to turn out, but even when they worked, the image would only be on one small part of the photo paper. Here are a few examples:

http://information-bureau.com/daily/060507/trees.jpg
http://information-bureau.com/daily/060507/legs.jpg

Does anyone know why this might be happening? Is the pinhole maybe too small?

I know the first one's not dark enough; this was our first attempt at developing our own photos, too. We'll get better at that; I'm just curious about the image being so small on the 5x7 photo paper.

Thanks for any help you can provide!

rbarker
Moderator

USA
3295 Posts
Posted - 08/05/2006 :  14:53:43  Show Profile  Reply with Quote
I haven't researched or experimented with DIY pinholes, so I'm not a good source of info on this. But, you might take a look at this page:

http://www.pinhole.cz/en/pinholecameras/pinhole_01.html

to check whether your pinhole is the right size for your oatmeal box. Other pages on that site provide additional info that may be of help, as well.
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Jim Jones
Newbie

USA
1 Posts
Posted - 24/05/2006 :  14:37:46  Show Profile  Reply with Quote
The pinhole should be made in very thin material. Otherwise, vignetting may occur because the pinhole acts somewhat like a tunnel. I use thin brass sheet, available from hobby stores or as shim stock from auto parts supply stores. Aluminum from beverage containers works fairly well. A site with much useful and interesting information on pinhole photography is http://home.online.no/~gjon/pinhole.htm.
Edited by - Jim Jones on 24/05/2006 14:38:46
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Daver
Geek

59 Posts
Posted - 26/05/2006 :  14:54:48  Show Profile  Visit Daver's Homepage  Reply with Quote
Aluminum foil also works great. Cut a larger hole in you box then cover it with the foil.
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