Murray wrote >>> BUT, people are telling me I will probably be disappointed by anything larger than 5 x 7 or so from my 35 mm pinhole negatives because they say pinhole images are "not very sharp". <<<
Murry, My favorite pinhole camera is a large popcorn tin. It uses 11x14 photo paper with a 2.5 to 4 min exposure time in the sun. My lens is highly technical, I poked a hole with a straight pin in an old piece of pop can, no idea what size it is. :-) The photos are very sharp and if I EVER get better with stiching scans together I plan to publish them to the gallery. My newest large format pinhole, I am working with this fall, will be 24" in dia and 36" tall. I plan on using roll mural photo paper. Good luck, Chuck Flagg