My 180 works fine with my 500C/M. Although I believe a very slight portion of the top of the image gets cut off in the viewfinder. That part is in the negative though. I could be wrong may be that that part gets obstructed from the viewfinder when I have the extension tube on with the 180.

Quote Originally Posted by rbarker

I believe that the all-chrome lenses were for the earlier 1000/2000 models. I'm not sure about full compatibility of those lenses with your 500C/M.