I have an 8x10 camera made by Rochester Optical Co. the plate says Standard. It was # 104 and the original lens had a slot to accept a vane with hole in it for apperture. It is in great shape and I've been restoring it. My question concerns film holders for it. I have seen several and they are of different thickness. D oes that pose a problem with film plane and sharp focus? Where can I possibly ge t a couple of holders made for this camera. I have been involved in 35 mm and 2 1/4.for 40 years. This view camera was hande d down to me by my family and I'd like to learn to use it. TIA Ron