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T3i Locking Exposure in video mode?


When some one moves an arm on camera I can see the exposure changing on the lcd monitor. Using older lenses I can see exposure changing/flickering as I zoom in or out.


How do you lock exposure in video mode?  Even my several year old HV20 had a not-in-the-manual way of locking exposure.


Any video people here? I know how you lock exposure for still photography. I'd think the answer to this would be out there and not something that even stumped my local camera store.


John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic

Thanks, I will have to reread your link and experiment with my camera tomorrow. The only thing it seems right now that I was doing wrong was leaving the ISO to AUTO. Also, I am using older lenses which flicker exposure when zooming(possibly in Auto  ISO). One newer lense doesn't seem to flicker exposure changes when zooming even in Auto ISO.


MAYBE the non-zoomed, tripod shops where the exposure changed with the moving of the actors arm I took a few days ago was soley related to ISO on AUTO.   I HOPE. Otherwise, I don't see a solution to a such a seemingly simple problem.