I went on a ski trip to France last year with my GoPro Hero4.
1) You'll need more batteries. With constant filming, they only last about 45minutes at best. I recommend getting either Smatree or Wasabi brand. They're much cheaper. I took EIGHT (
with me for a full day on the slopes. A couple of days I did go through 6 of them.
2) Get the GoPro recommended SD cards at least. I got two 64GB Sandisk Extreme Pro. That's a little overkill for speed, but I had NO problems with them at all. You'll need at least two per day.
3) You'll need a laptop to save each days disc so you can start out fresh the next day. I didn't want to lug a laptop overseas so I got a 1TB
Western Digital My Passport Wireless. It has a SD card reader built in and you can access it with your smartphone to check on your files, etc. I also renamed each file as Day1, Day2, etc. It worked perfectly.
4) I used, for first person prospective, 1080 Superview @ 60fps. It picks up allot more scenary and you and use slow motion with it. When I wasn't skiing and filming with the camera in my hand, I used 2.7k medium so you can use digital zoom and not loose your 1080 resolution. I found medium gave the most "normal" view.
5) I used ProTunes all the time. Set your sharpness to low. Set your ISO as low as you can. During the day 400. At night you'll have to go up higher but the video will become grainy. ColorDirector does a really good job of correcting dark lit scenes.
6) You want some sort of "selfie" stick. (I used a clamp on my ski pole) You want to show yourself there. I wish I took more of me skiing in the Alps. It was my best footage.
7) I'm sure I've missed a bunch of stuff. If I remember I'll repost here again. Have fun.
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