I am new to the board so though I would say hello, but also thought I would start shooting film again, (there is just something about film) but I picked up a used A2E and it came with two extra focus screens. (ED-N matte and ED-C matte) but I cannot figure out how they are switched out. On my 5D the screen retainer just unclips but on the A2E it almost seem like it is held up by screws. If any one knows how to switch them out or knows of a write-up it would be greatly appreciated. Thanks