I just got LR3 and have tried using the lens correction. The Adobe correction for the 70-300 introduces a white vignette when I apply it. Apparently the lens is supposed to produce a vignette and the definition is correcting that.
But none of my photos show any kind of vignette. I've had to manually lower the vignette slider all the way to the left to eliminate a white halo on photos corrected with this definition.
I'm wondering if anyone else out there with this lens has tried the correction and if they see the same thing I do.