Hi, I'm not sure if this is a known issue, but maybe you guys could see if you can reproduce the problem: On my t3i, 'focus peaking' goes horribly wrong when I'm shooting video and use 3x digital zoom by pressing Disp and Zoom+ button, and then I go back to normal image by pressing Disp and Zoom-. As soon as I do this, I get wild horizontal lines all over the screen. Also, I noticed that the Magic Zoom focus assist also goes bezerk: instead of seeing the enlarged section to focus on, the screen pops up with vertical image divided in horizontal strips. The problem goes away only after I turn the camera off and back on. Does anyone have any idea why this is happening and what I can do to prevent it? I believe this is a bug in Magic Lantern. I really love Magic Lantern and the awesome focus assists, and I hope you guys will be able to fix this focusing problem in the next release.
Issue #1080 duplicate