I've been using an 11X14 cardboard box camera I made several years ago modified to use glass plate negatives. One problem I've had is in accurately composing the scene as there is no viewer as in an SLR. Sometimes I get lucky, and sometimes I don't. Now I'm designing a better variable focal length camera and would like to incorporate some way to 'preview' what the negative is going to see. Anybody have any ideas on how that can be done? I thought about using a ground glass, but I'd have to use a larger pinhole to get enough light in to see the image, and I'm thinking when I then change to the smaller pinhole for the photograph the angle of view would also change.