C100: Why does my C100 MKI continuously auto focus only with my Canon 28mm 1.8?

puredrifting

Major Contributor
Hi all:

Did a shoot at an ad agency today and noticed that for some strange reason, when I mount my Canon 28mm 1.8 lens on my C100, it continuously auto focuses, even when I have the menu set to "one touch"? What gives? Anyone hear of this before? I also have three other Canon EOS lenses and none of them do this. Something broken in the lens or? Am I overlooking something obvious? Had to turn it to MF to get it to quit auto focusing. Kind of obnoxious in the middle of the shoot.
 
So I guess nobody has ever experienced this? Weird. I may have to take both to Canon Hollywood and let them evaluate it.
 
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