Pls show examples where increasing brightness in post better than increasing ISO.

Started Oct 1, 2013 | Discussions thread
Steen Bay Veteran Member • Posts: 7,408
Preferred compromise

bobn2 wrote:

In any case, even if it does, the rigmarole that they have gone through to get there is a whole lot longer than the simple route, set the aperture and shutter for the largest exposure that your pictorial constraints allow, set the ISO to get the brightness, according to your usual methods for 'nailing the exposure brightness' (mine are do it at my leisure on a nice big computer screen).

Don't think it works like that. It's always a compromise involving all three variables (DoF/diffraction, shake/blur and noise, represented by the f-stop, shutter speed and ISO), not just two of them. I wouldn't just choose a f-stop and shutter speed, and then let the noise in the final image be whatever it turns out to be. Let's say that in low light I really don't want to use a slower shutter speed than 1/60 sec, but maybe that'll require ISO 3200 to get a 'properly exposed' image with the correct/preferred brightness, and then I'll maybe choose 1/30, ISO 1600 as the preferred compromise instead. If you don't take the ISO into consideration when choosing the f-stop and shutter speed, then you don't know how high the noise will be in the final image, because it's the ISO that tells you how high the exposure (strict definition!) actually is with the chosen f-stop and shutter speed.

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