I got a Marion Soho 3.25 x 4.25 SLR and while I was waiting for it I also bought 3.25 x 4.25 film holders. The camera takes graflex film holders with the 1/4 inch lip along each side however but I see I can easily epoxy some wood strips to the sides of the standard film holders and use them as one-sided holders. My question: is the depth from the front face of the film holder to where the film rests the same on each style so that I will not have a focus problem?