Yay! I am an idiot!!

Talking to a friend I discovered to my astonishment that unlike my wide and tele adaptors the BIG rolleinar goes on the TOP (viewing) lens!!!! I've been using this doggoned thing for years and never even knew it. Big "doi!!!" for me, unnngh. So the chromatic aberation was likely from the prism.

Next I suppose someone will tell me how to use the self-timer.

Still, I'm wondering if there are any design differences wrt date on Rolleinars.