I have a 24-105mm f/4L series I that is front focusing badly, but only at the wide angle end. Above about 50mm, focus seems accurate but at 24mm, what should be infinity instead gives me in the 3-5 meter range. It slowly gets better as I zoom out.
I’ve tested on three cameras- 5Dsr, 6D, and 80D- with identical results. I’m not using microadjust on any of the cameras. I bought the lens new in 2013 and it’s worked great up until just recently. My other lenses all focus accurately.
Is there a lens reset procedure or does it need to go in for repair? I’ve checked the Canon website and haven’t found any real info about this particular issue.
TIA for any info.
