I noticed something this evening that I do not recall having seen before. On my EF 100mm f/2.8 L IS USM Macro lens, the focus has to be course focused before the 'real' auto focus will home in on the subject. I have tried it at several different distances, with and without IS being turned on, always with the same results. My other lenses, Canon and otherwise, will jump from close-in to infinity and back again, but the 100mm doesn't budge until you at least manually bring it into course focus before causing a half shutter button action. If IS is turned on, you can hear the IS working, but the USM doesn't budge. Once you somewhat bring it into course focus (i.e. you can loosely define edges of the item), the USM will kick in and give tack sharp shots. Since I do not use this lens every day, and suffer from severe CRS (Can't Remember DooDoo), I don't remember this happening before.
Anyone out there with a 100 that can clue me in on whether I am just having a senior moment (and all is working correctly) or am I seeing a problem with my 'baby'?
For info, the contacts are clean, battery fully charged, lens cap off, AF 'ON' at Center Point in spot focus, etc. She is mounted on a 60D, and not in LIVE mode.