« on: September 25, 2013, 03:54:16 AM »
Lens profiles in Lr and Camera Raw are tied to both the body and the lens, plus they exist in two versions (JPEG and RAW). You'll only see the automatic combinations that match your particular photos. In general Adobe's bundled pack of profiles only considers brand matches (Sigma lenses on Sigma bodies, etc.)
Effectively, most Sigma lenses have RAW adjustment profiles for Sigma, Canon and Nikon bodies - these were actually provided by Sigma itself and install with ACR/Lightroom by default.
If you want to use a RAW profile for your JPEGs, there's a small hack you need to do - find the matching RAW profile of your camera + lens, make a copy of it (delete the "RAW" from the file name, for example), and replace all iterations of CameraRawProfile="True" with CameraRawProfile="False" within the new copy.
The profiles are ".LCP" files which contain XML formatted instructions - they can be edited using Notepad.
You can find yours at C:\ProgramData\Adobe\CameraRaw\LensProfiles\1.0 on your Windows PC.
NOTE: This is not a perfect solution and if your camera already applies some distortion/vignetting correction to JPEGs, you need to turn it off before using the profile to avoid corrections being applied twice. That said, even the "RAW" optimized profiles help a lot, especially with distortion/vignetting.