It's a bit of a minefield, Oh.
The best traditional street photography is shot very close with a wide angle lens, like 28mm or 35mm on FF. There is that alarming documentary feeling in the shots of really being in other people's personal spaces. On APS-C, the Ricoh GR II is outstanding with its 18mm lens, and can be configured in the menus to be absolutely silent, nobody can hear anything, and you can preset electronically the focus distance to one metre or two metres or whatever, so you actually don't do anything but point from all angles and click, even while looking away.
The DA21 and DA40SX are pancake style lenses that make your DSLR-lens combo as small as possible.
If you're method is to shoot from a distance paparazzi style, it doesn't matter what you're packing. Hiding behind a mail box on the other side of the street you could be using a 70-200 f2.8 or longer.
So, creepy distant sniper vs confrontational snapper (Eric Kim, Martin Parr) are the two most common styles.
I have done both, but think there is so much gutless and dud street photography around - backs of guy's heads, girl looking down at her phone, etc. Done all that, and I reckon the better pics I've taken catch engaged people doing interesting things who simply don't care they're being photographed, or even cooperate for a shot.
Last edited by clackers; 09-07-2018 at 06:42 PM.