Recovering underexposure in raw
17There may be times when you don’t have a tripod and would prefer to keep ISO lower than, say, 1600. In these situations you’re going to end up with an underexposed image where exposure and detail will need to be recovered during post production. If you take this route make sure you don’t push the exposure too far because it will introduce noise, and what you’re doing here is essentially the same as using expanded ISO. This is counterproductive unless underexposing to save highlight detail at the expense of darker tones, so it’s better to raise ISO within the native range than to underexpose and then recover.
Use software such as Adobe Camera Raw to recover underexposed images