I posted this over at LFphoto.info but would love any additional ideas you all might have. Im new to this forum. Im interested in designing/building a 7x17 pinhole camera with the end result being contact printing the images. Im interested in it being a fairly wide angle (of course) and perhaps holding only a single sheet of film at a time or maybe trying to design a way to mount a 7x17 film holder. does anyone have any experience with creating and making cigar box cameras and/or pinhole cameras in the larger than normal formats (7x17 etc)? The basics Ive been able to determine are that a pinhole creates an image circle of about 150degrees therefore an image circle of 20inches would be created if the focal length (dist from pinhole to film plane) is about 6inches. the pinhole (from reading some links and websites) should be about .5mm in size. does this sound correct or even close to anyone? I realize that because of the large size of the film there may be dramatic light fall off and vignetting in the corners and edges of the resulting negatives but this is partly the endearing quality of it for me. I like the resulting look. basically Ive come up with a design that would employ a 20inch wide by 7 inch deep by about 7-8 inch tall box with the abiliity to change out the pinholes on perhaps a removeable holder of some simple design. what are anyones thoughts on this or perhaps similiar experience in creating something like this...... also.... in regards to actually using a lens what are good focal length lenses that might work for a fixed focus box camera like this in the 7x17 format? Im thinking along the lines of barrel lenses and the like because the exposures will like need to be fairly long I would assume. any thoughts on this would be appreciated. thanks in advance.