What you see on the picture above is a 8×10 large format pinhole camera I purchased recently from eBay. It takes 8×10″ sheet film. There’s no lens of course and the camera has an aperture of f/400 and a viewing angle of 116 degrees.
I was really impressed by the size of the film (and holder). Its really huge even compared to 4×5″. Placing the film I the holder was really a burden using my 4×5″ changing bag, so I will either have to get a larger one or simply do it in my closet. My first shot was taken with Ilford FP4 sheet film. I am currently waiting a box of Fuji Provia 8×10 slide film, viewing a 8×10 slide on the lightbox should be a great experience (even with a pinhole camera which of course cannot at all be compared to a normal 8×10 as far as image quality goes).
With pinhole cameras you have to deal with reciprocity failure since the exposure times are seconds or minutes. Ilford FP4 is not ideal for long exposures, so there are some exposure calculations to be made. My meter showed 9 seconds exposure needed and I kept the pinhole open to light for 25 seconds relying on an app called Pinhole Assist (iPhone). It calculates reciprocity failure for FP4 film, and I’ll see soon of the calculations were correct.
Now, the big challenge is to develop the sheet with my Patterson day tank using the taco method. I’ve read a lot about it in different forums, so I know theoretically what to do, we’ll see how it goes tonight.
A few more images of the camera from diff
(c)2013 Konstantinos Besios. All Rights Reserved.