as far as I know the Full Frame Canon lens profiles were generated from shots with a 5DMKII. As the smaller sensor only "sees" part of the lens' picture, the lens profiles cannot just be scaled. They have to be cropped instead. This is very important because vignetting, CAs and geometric distortions affect the borders of the image - a picture taken with a APS-C sensor often doesn't even "see" the problematic areas.
I have a EOS 500D body, a 28-135mm IS USM and a 50mm/1.8 lens. My impression is that the applied corrections in Lightroom 3.2 are not correct. It seems the profiles are scaled. Am I doing sth. wrong? Do I have to generate my own profiles?
Thanks in advance for your answers,
No...a profile for a full frame body will work just fine on a cropped body. The other way around doesn't...
If you think there is an under or over correction for your lenses, you can modify the amounts and save a new lens default. I find many Adobe profiles for Canon lenses undercorrect CA and a couple overcorrect lens distortions.
so Adobe corrects for the crop factor?
No...the crop of the sensor isn't a factor as long as the lens profile was made using the full frame camera.