Any problems with a Leitz CA2500, assuming it all works, is that a fine machine? Are any of the brauns worth looking at, since they may be newer. I am leaning towards the leitz but since all my slides are cardboard and plastic mounts I am not sure which lens would work best. Some of the older threads suggested that non glass mounted sides could pose a focus problems for the flat lens. Is the colorplan 1:2.5/90mm a good lens? Any recommendations THanks Norm