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50mm, or 35mm if you're adventurous. Cops are likely to use anything apart tear gas against you if you protect your eyes. You can get used to tear gas, just breath calmly and don't touch your face. Don't hesitate to push ISO (800+, a sharp picture is better). Spray and pray. Be aware of your surrounding, and who is in your perimeter. If you are cornered by police or rioters, go to the side lines where you'll usually find the press and street medics. Don't bring a wallet, home/car key in your trouser, not in a bag or jacket.
