GoPro Hero 4 FOV Comparison Test - Wide, Medium, & Narrow (Field of View Settings) - YouTube
DJI Osmo Action 4 unveiled: larger sensor than before makes this a true GoPro Hero killer - PhoneArena
New Version 5.0 Firmware for GoPro HERO4 - Linear FOV vs WIDE FOV Comparison - YouTube
GoPro HERO4 Silver vs HERO5 Black | GoPro Comparison Review
GoPro Hero4 Silver & Hero4 Black In-Depth Review
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Amazon.com : DJI Osmo Action 4 Adventure Combo - 4K/120fps Waterproof Action Camera with a 1/1.3-Inch Sensor, 10-bit & D-Log M Color Performance, Up to 7.5 h with 3 Batteries, Outdoor Camera