I've been doing quite a bit of landscape photography as of late, using a Sony NEX-7 and M-mount lenses. The DR that the NEX-7 offers at base-ISO is quite a bit greater than what I'm used to from my Canon DSLRs. As a result, I've been experimenting with single-shot HDR editing in LR4, mostly with B&W conversions. As long as I ETTR during capture, this actually works surprisingly well in LR4 (much better than in LR3 and earlier). However, LR4 shows a tendency to produce fairly wide haloes when extreme adjustments of negative highlights and positive shadows, clarity and contrast are combined.
Below an example where you can see light haloes around the dark contours of the lava hills and volcanoes. It might not be noticeable at first glance, but when you look closely, you can clearly see the haloes. I actually had to restort to brush adjustments in the sky because the haloes simply looked unnatural.
I was wondering if any of you have experience with this and would be willing to share techniques that minimize these haloes. Alternatively, I'd also be interested in experiences with this respect from other RAW-conversion workflows.
Many TIA for any insights you're willing to share!