XT3, Samyang 12mm f/2.0
ISO 400, f/2, 30seconds - edited and unedited in LIghtroom.
(Yes, that's ISO 400!)
I know the Fujifilm sensors have a considerable amount of ISO invariance (as do many other cameras - Sony and Nikon for example). Invariance is an insanely complex topic involving protons, analogue amplification, digital amplification etc etc that I am way too dense to really understand. That means that after a certain point, ISO really does not matter too much and you will get a similar result just by increasing RAW file exposure in post.
However, I believe there is a sweet spot for Fujifilm invariance. Last night I did some test shots using various ISO settings. I concluded that my cleanest shots - less noise to light ratio - were shot at ISO 400 then the exposure was increased in Lightroom on the RAW file.
Here's my ISO 400 example - the complete ISO 400 edited file and the straight out of camera ISO400 RAW file.
Does anybody have any views?
Next week I will talk more about my view of focus stacking and multiple exposure shots for Astrophotography - it may be a little controversial