Just thought I'd post a pic of my attempt at a 4x5 pinhole camera. 40mm f-133. Overall size is slightly larger than a film holder and about 2" deep.
Total investment so far, $2.68. The cost of two t-nuts nearly doubled my cost, and unfortunately, I still have to budget for some black felt for the light trap. It looks like this project is spiraling out of control.
This is yet to be tested, but I figure if a Zero Image can cover 4x5 at 25mm, I should be ok. I'll be taking this on vacation to Arizona next week. If I get anything worthwhile, I will let you know.
(I apologize in advance for the digital picture here, but as I understand it, pictures for illustration purposes are permitted. If this is out of line, the mods may delete as they deem appropriate.)