So, my first assignment for my photography class that I'm taking is to make a camera obscura. The teacher explained to us the basics of them, and how the greater the distance from the pinhole to the rear of the camera, the narrower the field of view, and the closer, the wider angle of view. Now I don't feel like being like all the other dumbasses in class and just poking a hole in an empty shoebox and calling it good, I want to make something interesting. Now am I understanding this correctly that if I take a cardboard tube that is 6" in diameter by 4 feet long that it will be a "telephoto" camera? And on the opposite end of the specturm, if I take something like an empty chewing tobacco can (about the size of a hockey puck) and use that since the distance from pinhole to rear of the container is small that it will be like a UWA feild of view? Anyone have experience with these and let me know if I'm on the right track? I want to make my camera unique, not just some shoebox with a hole in it... lol EDIT: The other idea I had was what happens if you take something like dryer exhaust tubing and use that, but put a slight curve in it, will that distort the image or will it just make the camera unusable?