Nikon auto ISO and exposure bracketing [Df]

Mar 23, 2020
Let's set the scene: M mode, automatic ISO, no flash.

I set up the bracketing by AE. Take a test triplet.

To my surprise it is not ISO that is varied, but the shutter speed. I shot test scenes with ISOs between 400 and 1400 and my bracket was +/- 1 stop so there wasn't any problem hitting the "boundaries".

Consulting the manual reveals that in the case of auto-ISO the camera will first and foremost adjust ISO to bracket, but only in modes A, S, P. Not M where it would make most sense?!

If someone knows the design rationale why this feature works so incomprehensibly, let me know. I'm pretty frustrated when I encounter simple problems like these.
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