pinhole photography

[ksmattfish]

Edited due to broken link

 

[vonnagy]

Rusted Mother of Spring

very cool shot, but what in the world is that? it looks like a skeleton or something :scratch:

 

[jack]

f/200+?..

hi matt, how's is this value estimated ?

cheers..//jack

 

[P Bailey]

Ansco Memar, 35mm, ISO 100 film. Exposure times 1 minute to 1 minute 30 seconds.

 

[voodoocat]

Uhh... mr bailey is this not a thread for "Pinhole Photography"?

 

[ksmattfish]

Vood- He's using a pinhole modified cam.

Vonn- It's a fertility goddess sculpture I made out of rusted wire.

Jack- Sunny 16 rule; the recommended exposure time for ISO 400 that came with the camera is 2 sec, so I figured: 1/400, 1/250, 1/125, 1/60, 1/30, 1/15, 1/8, 1/4, 1/2, 1, and 2 sec, that's 10 stops. So adjusting 10 stops on aperture: f/16, f/22, f/32, f/45, f/64, f/90, f/128, f/180, f/256, f/360, and f/512.

I go with f/256 because: 1) the pinhole may be off from the manufacturer's recommendations, 2) I'd rather error on the side of overexposure than underexposure, and 3) reciprocity begins breaking down with shutter speeds longer than 1 sec, so 2 sec may not really be twice the exposure as 1 sec. This is a bigger deal when it is cloudy (6 sec exposure) or overcast (16 sec exposure). These were 16sec exposures on an overcast day and I'd say the negs are about 1/2 stop overexposed.

If you purchase a laser made pinhole it will usually come with info that tells you the exact f/stop.

 

[jack]

matt: thanks for the tutorial. excellent.

 

[Jeff Canes]

Took this with a pinhole lens made for a body cap
Hassy 500cm at about 2 minutes