« on: September 15, 2012, 04:34:23 PM »
I've been lurking here for quite a while now, and now I've come across something that has prompted my first post.
I have a 5DMkIII body, 24-105mm f4L, 16-35mm f2.8L and a very recently acquired 70-200mm f2.8L IS II which has replaced my 70-200mm f4L IS lens. I had used Reikan FoCal to do an AFMA adjustment on my older lenses, but have not yet done so for the new 70-200 f2.8. Today was the first time I took the new big zoom out for a day's photography and I couldn't undestand why it didn't seem to be focusing properly when looking at images zoomed in on the camera's LCD. I have just uploaded the day's images onto my PC and had a 100% view of the RAW images. A lot of them were OOF, and I was quite surprised to see non zero values in the AFMA field of the EXIF data.
The camera identifies the 70-200 f2.8 L IS II correctly in the AFMA menu, and both W/A and Tele settings are still showing as zero. The menu option to adjust by lens is selected, so the camera should NOT have taken it upon itself to apply any AF adjustments to the shots taken with the new lens. There is an AF menu option which reads "All by same amount -8", but I have never selected it. Could this be telling the camera to override the zero values for my new lens because it hadn't been completely registered with the camera?
Has anyone else come across this feature? Is it a bug?
I'm going to delete the AFMA settings for the 70-200 f4L IS, as it's being sold, then run FoCal against the new big zoom tomorrow morning and hope that will sort out the problem for me.