Disappointed in 40mm pancake
I bought this lens primarily for video based upon this part of the description: "STM functionality provides quiet, smooth and continuous autofocus during video operation". NOTE that there is no asterisk next to this.
The instructions packaged with the lens do not mention video at all, and I couldn't get it to work on my 5D mkII so I went to google in search of an answer and found this nugget:
"As to continuous AF during video, the only Canon camera that will do this is the T4i."
NOT HAPPY! Should have done more research