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Talk about LONG exposures.. (pinhole)
Old 04-27-2010   #1
italy74
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Talk about LONG exposures.. (pinhole)

Hi guys
I'm not much into pinhole cameras but I found this news that could be nice to read about an experiment made in Bristol a few years ago.
I won't tell you anything...

http://www.mentalfloss.com/blogs/archives/21666
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Old 04-27-2010   #2
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I believe it's called solargraphy...
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Old 04-27-2010   #3
charjohncarter
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That is a long exposure.
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Old 04-27-2010   #4
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I love it but I would have guessed 1/4 of a mm would be way too large for six months of daylight, even on paper. Only goes to show I'm better off using lenses... Imagine underexposing a shot that's six months in the making.
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Old 10-25-2010   #5
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I think that's awesome. I want to try that myself. I have plenty of soda cans
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Old 10-25-2010   #6
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Beautiful stuff. I love the more impressionistic photography like this.
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Old 10-25-2010   #7
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See also: http://www.solargraphy.com/
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Old 10-27-2010   #8
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Here, I read somewhere is you scan the pinhole, zoom it up and count the pixels. Divide the pixels by the resolution and you have your fstop.


http://www.chriskeeney.com/photograp...ographers.html
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Old 11-10-2010   #9
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I can recommend giving this a go. I now have several pin hole cameras made from beer cans and film canisters secreted around town.
I get very frustrated at times because I don't get a lot of time to go out shooting, especially in the short winter days but by making solargraphs I know that I can now take photographs 24/7.
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Old 11-14-2010   #10
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Quote:
Originally Posted by scottyb70 View Post
Here, I read somewhere is you scan the pinhole, zoom it up and count the pixels. Divide the pixels by the resolution and you have your fstop.
Divide the number of pixels by the scanning dpi, which gives you the pinhole's aperture diameter.

To determine the f/stop you then need to do a little math OR plug in both the diameter and your pinhole camera's focal length into one of the online pinhole calculators . I use this one:

http://www.photostuff.co.uk/pinholec.htm

I wrote a bit on making your own pinholes here:

http://www.flickr.com/photos/36exposures/4463977832/



Solargraphy can be very interesting! Here is one that I exposed for 4-days:



I hope you all give solargraphy and pinholing a try!
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Old 11-17-2010   #11
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4 day exposure? I'm surprised the batteries didn't run flat
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Old 11-22-2010   #12
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Quote:
Originally Posted by ChrisCummins View Post
4 day exposure? I'm surprised the batteries didn't run flat
Good one! Heheh!
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