My experience with HDR Efex 2 - overall, excellent. However, I have gotten terrible results with skies (very uneven tones). As the result of playing around looking for a solution, I found that if I turn off the anti-ghosting feature, it looks fine. For what it is worth, I have never had trouble with skies using the first version. My solution for doing HDR that includes skies -I begin by bringing the bracketed shots into Photoshop's HDR processor. There I eliminate ghosting using Photoshop's anti-ghosting feature. I end up with a 32 bit Radiance file. Then I use HDR Efex 2 to tone map that 32 bit file. It works great. (Note: if you save the Radiance file, you can use it over and over to try out different tone mapping with any HDR software.) (Also note: today's post did not use HDR.)
@Curly: Thanks, Curly. The radiance file works equally for being tone mapped in Photomatix.
@Phil Morris: This is not an HDR photograph.
@Heinz: Heinz - I was joking with you yesterday. All of us, no matter what our ages, would do better always using a tripod:))
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Probably the problem that I have with skies doing HDR composites would be resolved by always using a tripod; then the anti-ghosting features would not be necessary.
@bluechameleon: I was never happy doing HDR processing with CS5.