Ugly banding in sky (32-bit HDR)

I've seen this a few times now, and decided to ask if anyone else has come across it.
When developing 32-bit HDR images in Lightroom (merged in Photoshop) I sometimes get these discoloured bands across the sky. (Top left corner.)
I tried to see if any of the sliders (clarity/shadows/highlights/etc) caused these coloured bands, but they are there even if I reset everything and just lower the exposure to get the colour back in the sky:
For comparison, here is the -3 EV exposure which was part of the (three-frame) HDR. As you can('t) see, there is no banding going on here:

Canon only offers this capability to pros shooting 1 series bodies, but you can still shoot six images almost as fast with other bodies like your 7D.
Adjust all the camera settings normally used for HDR shoots. Next set Exposure Comp./AEB for ±2 EV exposure bracketing, shift it -3 EV (-5, -3, -1) and save to Camera User Setting C1. Next shift the ±2 EV bracket to +3 EV (+1, +3, +5) and save to custom function C2. Shoot the first bracket with Camera User setting C1, select C2 and shoot the second bracket. You will have six 2 EV spaced exposures spanning 10 EV (-5, -3, -1, +1, +3, +5) from which you can select the best three, five, or even all seven for the HDR merge.
You could also use a ±1 1/3 EV bracket, which will give you six images spanning 6 2/3 EV. This is more than the 6 EV range you're using now and with less than 1/2 the EV spacing. You can select the best five images based on the scene exposure, or use all six.
This of course assumes you don't need the two custom functions for other purposes and are using a tripod. I use a Canon RC-6 remote to help prevent tripod shake. You must set the camera's drive mode to 10 sec. or 2 sec Timer/Remote Control and set the RC-6 remote switch to the lower setting ( not 2 sec. delay). Canon's documentation on remote usage isn't very detailed so it took me a while to figure this out. This also works best when shooting tripod mounted without the remote, since the 2 sec. delay lets the tripod settle after pushing the shutter button with your finger.
There are more costly alternatives like the 'Promote' remote controller or running tethered with a laptop.
http://www.promotesystems.com/products/Promote-Control.html

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Re: Before/after: LR4.1 for 32-bit HDR images - wow! created by Susan
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burnet44 wrote:
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http://www.johnmaclean.com/32bit_black1.png
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In 32-bit color space you have very limited options in Photoshop. The vast
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Regards

Ugly banding in sky (32-bit HDR)

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