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The great thing about this is that it works even when you're wearing gloves.

Doesn’t matter. That‘s just equivalent to the physical switch in time needed (maybe even slower, a double press does require more dexterity) and startup times on phone cameras certainly aren’t faster than dedicated cameras. My iPhone 12 Pro takes about a half second to a second until it‘s ready to take a shot.

iphones have it as a button on the lockscreen. Double tap opens apple pay and long hold opens siri. Wish I could swap out siri for camera tbh.