When I try by lens and a sigma lens, the AFMA sets itself to "disable" and I cannot get it out of there... thats at a higher/menu level. The at a detail level, I can set overall for all lens or individual by lens. AFMA will let me tweak/ set these levels even though at a upper/ higher/ header / menu level, is keeps saying disabled.
I thought that by using the All lens setting (even though disabled) When i set my 15-30mm to +5, I got sharper pics... but I am not sure I am. Perhap more testing is required, but before that I just wanted to ask around and see if AFMA works with non-Canon lenses.