I want to build a pinhole camera.It is almost done.I still have problems to fix:when I take a shot, I have to measure how much I have to turn the film so they do not mix-up or if my pinhole design is ok(I mean in mm.) This are the details: imageshack.us/photo/my-images/339/pinholedesign.jpg/ Focal length: 28mm Pinhole diam: 1mm F-stop: f28 I have an AgfaPhoto 200 film, Vistaplus.I guess it is too sensitive, I should go for a simple B&W film.I now this is based in general on trial and error but I do not really aford it... Some help with the f28?I need some very clear data sunny-exposuer, cloudy -exposure ) Do I have an optimal pinhole camera design, to short exposures? I am very new in photography, I am a simple amateur.Sorry for my rusty english and my chaotic way of writing, but the ideas and questions just pop-up. I love this site, this is the place to learn real photography. Best wishes, Alex Cruceru.