Hi all I've a hankering to build a 5x4 point and shoot camera might be able to get hold of either a 47mm or 90mm super angulon both mounted in shutters. Main object would be landscape and perhaps architect. first, which lens? Second, do I need a focus mount, would it be a good idea to get hold of a camera ( especially with a graflok back) and start there. any pointers would be greatful.