08-29-2015 10:40 AM
Is it possible that the AF/MF switch on the lens has accidentally gotten flipped from Autofocus to Manual Focus? That will turn the little red lights off, and it can be a little confusing when it happens.
08-29-2015 10:47 AM
I thought of that, but I tested it on my T5i and 1D Mark IV and they do light up in MF and it will beep when focus is achieved. Is that new for later models than T3i?
08-29-2015 11:48 AM - edited 08-29-2015 11:54 AM
No idea but I do know from personal experience that when the AFMF switch on my Sigma 35mm lens gets bumped to MF, the red points are not visible in the viewfinder of my 6d.
Perhaps they would appear, and/or beep if I was doing it on purpose, and I was manually focusing, but it seemed like the OP would not have been intentionally doing manual focus.
08-30-2015 03:27 PM
Trying this now. Will let you know how it goes.
To the other questions:
- works fine in all modes (I shoot in M all the time)
- other indicators in the viewfinder are working fine
- AF is on all the lenses