LR5 Beta

Just messing around with some window lit yarn that was on the table this morning and when I put it into LR5 Beta, there was quite a bit of haloing in the background out of focus and slightly bright edges, enough so that if I'd wanted it, I wouldn't have used it and couldn't make it go away. So I deleted everything and downloaded it into LR3 and it was still there but much less so, in a way that I might not have noticed it had I started with LR3. My reaction was oh well, they've got a long way to go and I deleted everything but then I thought maybe I should mention this. Anyone else notice this? I'm sure it will come up and I'm not a technical pixel peeper normally but it's probably important. I was using a IDMKIII with a 24-70 in soft sidelight with a fair amount of contrast. Sorry, I didn't save the images, they weren't really photographs, just stuff to see what would happen.

In terms of tonal rendering there is nothing new in LR5 that isn't already in LR4. It is still P.V. 2012. (In fact, there have been more than a few complaints that the additions to LR5 aren't enough to justify a new version number and an upgrade payment.) So it doesn't sound like what you are seeing is a matter of incomplete development of the beta and you probably would have seen the same thing in LR4. One thing that occurs to me is that Clarity is stronger in P.V. 2012 and strong Clarity can cause haloing, although Adobe said that what made possible the strengthening of Clarity was that they managed to reduce haloing. Another possibility is the difference in the way in which P.V. 2012 treats overexposure, but I would have expected decreasing Highlights to reduce haloing caused by overexposed edges. It's too bad that you deleted the CR2, I would have liked to take a look at it.