The latest firmware upgrade (v 5.0) for GoPro 4 cameras allows you to shoot 2.7k and 1080 video in linear field of view. This flattens the picture and removes the extreme fish eye distortion common with GoPro video. On the new GoPro 5, you can use linear FOV on both photos and videos. If you're into photogrammetry/ structure from motion/ stereoscopic work (or just prefer a more 'normal' look) you could previously only do this with editing tools, so this new feature could really streamline your workflow.
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