What resolution should I use for outlast?

There's no "best res" but for example, when you're running No Oob it's good to have 1024x768 because it makes some tricks easier.

best res is 720p full screen No Kapp

If it's in HD or lower it removes camera lens breaking effect

Yeah, i already knew that. I'm playing 720p atm

UPD: I'm dumb, you actually have to set the effects on low or very low. That's all