Pinhole Photograph with 6-month exposure

lmchelaru · 12-30-2009, 10:47 AM

Quote: Originally Posted by Actor

The pinhole was 0.25 mm in diameter. A soda can is about 120mm high so his aperture would be f/480.

3600 sec/hr * 24 hr/day * 180 day/half year = 15,552,000 sec. Round that to 16,000,000 sec

By the sunny 16 rule film speed should equal shutter speed so he needed an ASA 1/16,000,000 if his aperture was f/16. But his aperture was f/480, approximately 5 stops smaller. His film's speed needs to be 5 stops faster than ASA 1/16,000,000 or approximately ASA 32/16,000,000 = ASA 1/500,000 = ASA 0.000002. If he were using ASA 100 film then he needed a neutral density filter with about 22 stops attenuation.

Thanks for that. That's gonna be really useful if I try to do it...

Actor · 02-13-2010, 09:35 PM

Quote: Originally Posted by O|||||||O

Quote: Originally Posted by Actor

By the sunny 16 rule film speed should equal shutter speed so he needed an ASA 1/16,000,000 if his aperture was f/16. But his aperture was f/480, approximately 5 stops smaller. His film's speed needs to be 5 stops faster than ASA 1/16,000,000 or approximately ASA 32/16,000,000 = ASA 1/500,000 = ASA 0.000002. If he were using ASA 100 film then he needed a neutral density filter with about 22 stops attenuation.

You're not accounting for reciprocity failure though, which I bet would be pretty significant on a 6 month exposure.
Plus, at night there wouldn't be much light, if any, hitting the film.

Obviously, the results weren't 22 stops overexposed - so I'd say it worked.

Did it work? Even throwing in a few stops one way or the other for reciprocity failure and nighttime I think my figures are in the ball park (on a log scale). I'm wondering if this might not be a hoax?

AnaBo · 05-06-2010, 09:24 AM

beautiful.. how come I always get my shots waaaay over or under.. I guess thats why this guy is a pinhole pro.

genker · 05-19-2010, 12:16 AM

The spectacular picture shows each phase of the sun over Bristol's Clifton
Suspension Bridge taken over a six month period.
And thanks for sharing your view with us. Here is a great offer for photography lovers. You can create your own photo album online and get 20 free Photo cards AND 20 Free Photo Prints immediately. You may follow this link: www.zerotofive.com.au/photocards.htm

cfphoto · 05-19-2010, 02:41 PM

Very cool... thanks for posting.

02-13-2010, 09:35 PM	#17
Actor I spend too much of my life on TPF! Join Date: Mar 2007 Location: Ohio Posts: 413 My Photos Are NOT OK to Edit Thanked 8 Times in 7 Posts My Gallery: (0)	Quote: Originally Posted by O\|\|\|\|\|\|\|O Quote: Originally Posted by Actor By the sunny 16 rule film speed should equal shutter speed so he needed an ASA 1/16,000,000 if his aperture was f/16. But his aperture was f/480, approximately 5 stops smaller. His film's speed needs to be 5 stops faster than ASA 1/16,000,000 or approximately ASA 32/16,000,000 = ASA 1/500,000 = ASA 0.000002. If he were using ASA 100 film then he needed a neutral density filter with about 22 stops attenuation. You're not accounting for reciprocity failure though, which I bet would be pretty significant on a 6 month exposure. Plus, at night there wouldn't be much light, if any, hitting the film. Obviously, the results weren't 22 stops overexposed - so I'd say it worked. Did it work? Even throwing in a few stops one way or the other for reciprocity failure and nighttime I think my figures are in the ball park (on a log scale). I'm wondering if this might not be a hoax? __________________ Actor I'm so old I remember when quarter pounder meant you got a pound of meat for a quarter.

05-06-2010, 09:24 AM	#18
AnaBo No longer a newbie, moving up! Join Date: Apr 2010 Location: Mexico Posts: 82 My Photos Are NOT OK to Edit Thanked 2 Times in 2 Posts My Gallery: (0)	beautiful.. how come I always get my shots waaaay over or under.. I guess thats why this guy is a pinhole pro. __________________ "Once ... in the wilds of Afghanistan, I lost my corkscrew and we were forced to live on nothing but food and water for days." -W.C. Fields

05-19-2010, 12:16 AM	#19
genker TPF Noob! Join Date: May 2010 Location: australia Posts: 2 My Photos Are OK to Edit Thanked 0 Times in 0 Posts My Gallery: (0)	Pinhole Photograph with 6-month exposure The spectacular picture shows each phase of the sun over Bristol's Clifton Suspension Bridge taken over a six month period. And thanks for sharing your view with us. Here is a great offer for photography lovers. You can create your own photo album online and get 20 free Photo cards AND 20 Free Photo Prints immediately. You may follow this link: www.zerotofive.com.au/photocards.htm

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12-30-2009, 10:47 AM	#16
lmchelaru No longer a newbie, moving up! Join Date: Nov 2009 Location: Georgia Posts: 72 My Photos Are OK to Edit Thanked 0 Times in 0 Posts My Gallery: (0)	Quote: Originally Posted by Actor The pinhole was 0.25 mm in diameter. A soda can is about 120mm high so his aperture would be f/480. 3600 sec/hr * 24 hr/day * 180 day/half year = 15,552,000 sec. Round that to 16,000,000 sec By the sunny 16 rule film speed should equal shutter speed so he needed an ASA 1/16,000,000 if his aperture was f/16. But his aperture was f/480, approximately 5 stops smaller. His film's speed needs to be 5 stops faster than ASA 1/16,000,000 or approximately ASA 32/16,000,000 = ASA 1/500,000 = ASA 0.000002. If he were using ASA 100 film then he needed a neutral density filter with about 22 stops attenuation. Thanks for that. That's gonna be really useful if I try to do it...

05-19-2010, 02:41 PM	#20
cfphoto No longer a newbie, moving up! Join Date: May 2010 Location: Richmond, VA Posts: 57 My Photos Are NOT OK to Edit Thanked 1 Time in 1 Post My Gallery: (0)	Very cool... thanks for posting.

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