I regularly shoot 720p/50fps video at ice skating events with a Canon 7D + Samyang 85mm f/1.4 manual focus lens. I set the ISO at 6400 and with the aperture at 11, I have most of the ice rink in focus.

Unfortunately, light conditions sometimes force me to open up to 4, and manual focus gets really hard to get right on fast-moving ice skaters.

Canon 7D has no continuous autofocus in video mode, so I thought of switching to an X-mount system with Fujifilm X-E3 and an XF 56mm f/1.2 lens, but did not have a chance to try it out. Is the manual focus easier with an EVF? They seem to have a few modes that help manual focus, but what about the EVF lag?

Any other recommendation? Sony A7S is somewhat pricey, and I am not sure that it can autofocus well enough for my needs either.

I can also switch from 7D to 5DmkII and still shoot at 720p/50fps with an extra sensitivity of a bigger sensor. But this will mean losing some DOF, and I won't have continuous autofocus so what's the point?

Last but not least, is there a system that has fast enough continuous focus to track an ice skater? They move fast, but the background is mostly white and the distance varies between 10 and 40 meters.

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