Since HDR images contain much more latitude, it would be nice to have a wider adjustment range for them in ACR.
With HDR you have to crank up the sliders for pretty everything to their max to get a decent result, though I still often would like to have possibilty to bring down the highlights a bit more when I am already at -100.
Is it possible to get extended values for HDRI images in the basic settings panel like it is offered with exposure where you get +-9 instead of just +-5?
It would be good to have the values extended to +-200 or atleast +-150 (excluding clarity, saturation and vibrancy)
The Highlights, Shadows, Whites, and Blacks controls automatically adjust their range based on the dynamic range of the input image. In particular, Highlights at -100 will have more range for HDR images than for LDR images. We cannot compress the tones much more than that without introducing artifacts (or significantly increasing the performance costs), which is why the limit is currently set the way it is. But of course there is room for improvement & revision in future.
Europe, Middle East and Africa