erich musick's blog

I went out shooting this afternoon with my Sigma 17-70 f/2.8-4 OS to test it out after getting the AF adjusted to correct a severe rear focus issue I was encountering. It turned out I'd accidentally reset my D90 from RAW to JPEG and when I went to edit the images in Lightroom 3, I discovered that it couldn't find a matching lens profile. A quick Google search led me to learn that the list of available lens profiles differs when editing a JPEG vs one of the RAW formats. I went back and checked some images I'd taken earlier and sure enough, the profile appeared.

So, for anyone else who is wondering ... Several of Sigma's lenses can be corrected in Lightroom only when you shoot in RAW. Apparently on a Windows 7 PC you can find the list of lenses supported in RAW at the following location:

C:\ProgramData\Adobe\CameraRaw\LensProfiles\1.0\Sigma\Nikon
(replace Nikon with your camera body manufacturer)

Source: Lightroom Forums - Lens profile - Sigma 17-70 F2.8-4.5 DC Macro