ISO Bracketing.

[Fordsabroad]

I am using the Fuji GFX 50s. From all reviews there seems to be little difference in the noise on shots taken up to 400 ISO.
With this in mind I am thinking that if I shoot landscapes at a base ISO of 100 and set the camera to ISO bracket 1 stop either side of that in theory this should take care of not blowing the highlights and being able to retain the shadows in most cases. This would negate the need for a grad ND.
I appreciate that I can achieve this by normal bracketing but by doing it this way I get a spread of exposure values in one shot which means that moving subject (IE waves and clouds) are the same in all 3 shots.
This would make exposure blending simple in PP.
This seems to be a simple and effective solution to exposure blending. Am I missing something?

 

[sk66]

With that camera you can just underexpose to save the highlights and recover in post. There's not much point in using ISO to bracket; especially w/in 1 stop of ISO 100... ISO is not exposure with digital.

This chart shows the benefit (difference) that changing the ISO provides. While it's not entirely flat (ISO invariant) it's bordering on being nearly imperceptible (≤ .5EV).



Used w/ permission; link-

Shadow Improvement of Photographic Dynamic Range versus ISO Setting

 

[Fordsabroad]

Sk 66 Thank you for that information. It is not the first time you have replied to a post of mine with helpful and relevant comments. I appreciate the effort you take to do this.

 

[sk66]

Sk 66 Thank you for that information. It is not the first time you have replied to a post of mine with helpful and relevant comments. I appreciate the effort you take to do this.

You're welcome...

I should note that you are always better off collecting more actual exposure (light) when you can. So you would be better off recording the brighter bracket image (e.g. slower SS) for the non-moving portions of the scene and compositing that with the other recovered/highlights image. But if it's only w/in 1 stop and at lower ISO you'll probably find it's not worth the hassle.