From Wired‘s How-To Wiki, here are some good tips for photographers. (These tips work just as well for protests on the right or left, by the way!)
One key reminder, for those who take pictures with a smartphone: there’s a lot of risk in losing all your contacts and email if someone takes the phone from you, or if you drop it in a crowd.
I’d only recommend a smartphone for spur-of-the-moment pictures. If you have time to prepare before going to a protest, don’t take a device that has important information on it.
If you must use a smartphone, look around for a program that remotely locks or erases the phone should you lose it. There are programs like this for both Android and Apple smartphones.
A simple digital camera is a much better, cheaper choice.
Wired‘s tips include preparing the camera’s settings and memory card, and adding a ‘return if found photo,’ among other good ideas.
See, Wired How-To Wiki.