This may seem a stupid question. But I'd like to know...technically if I choose low ISO in natural light I will go for 1s to severall seconds of exposure regardless the choosen aperture.
Low Iso gives me less noise but long exposure times brings the noise too, am I wrong ?
So wich is the best choice , I can imagine a curve "amount of noise/exposure time" against the curve LOW ISO/HIGH ISO .
Is there an exposure time limit , over this limit it's better to go for higher Iso.
Assuming that I'm working with a P25+, I don't have much choice for exploitable high ISO 400 would be the maximum...
These are my reflexion and questions...do I miss something ?