March 31, 2016 at 8:22AM, Edited March 31, 8:49AM

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Filming backcountry ski action

Hi,
Here is my question: How can I possibly adjust my focal length as well as my focus while trying to follow the action which is going at speeds varying between 20 and 50 km/h? Is there something I don't understand or any tricks I should know?

Here is my story:
I go backcountry skiing in remote locations where I have to carry all my gear on my back. The walk to get to destination can be up to 12 km. Once on location, every day I shoot, I also need to carry all my gear on my back while climbing up mountains. Hence, weight is a big factor and everything I bring must be important. Weather is also a big factor: the wind, the cold and the snow.

Currently, I have a Canon 6D with various lenses. I rarely use this camera when shooting action heavy scenes as it would be way too hard to keep focus and I can't do any slow-mo (80% speed if going from 30 fps to 24). I am using the Canon VIXIA HF G30 for these shots (AF and 60 fps). However, with its 1/2.84-inch HD CMOS sensor, it really doesn't do all that good, especially when compared to the image quality of the 6D. So I was thinking of getting the Sony PXW-FS5 (which is also not too heavy). However, I am still stuck with my last problem... A rider is going down the slope, going left and right coming towards me, jumping cliffs... How can I possibly adjust my focal length as well as my focus while trying to follow the action which is going at speeds varying between 20 and 50 km/h? Is there something I don't understand or any tricks I should know of?

Side question: The Sony PXW-FS5 does have autofocus...anyone knows if it's good enough to shoot a fast moving subject like in my situation for times when Manual Focus is not an option?

Thanks!

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