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That's not correct: the focusing surface is on the bottom, but the registration surface is on the top, so the thickness does matter. I have measured the thickness of Rollei focusing screens as 1.2mm (but I'm not sure if all are the same). Depth of focus of the Rollei lens wide open is about 0.2mm, so if your new screen is at least that close to your old one you can use it without readjusting focus. If you do have to readjust focus, there are 2 ways to do it: if the new screen is thin, you can place shims between the screen and the frame, or if it's thick you can shim under the mounting flange of the hood when you reinstall it.... or, you can do it the "proper" way by removing the front fascia panel and rotating the viewing lens to the proper position for the new screen. It's not prohibitively difficult. (okay, shameless plug here: i sell replacement screens for these cameras) rick : ) = |