I'm unable to find the Lens profile for the Sigma 17-70 F2.8-4.5 DC Macro.
It's well detected in the metadata but no profiles are available for correction.
I can't find it also in Adobe Lens Profile Downloader.
My camera is a Canon 400D; the correction profile of my Canon 55-250 is available
I'm using Lightroom v3.3. The problem was also there with v3.2.
Any help is welcome
Welcome to Lightroom Forums.
Lightroom and Camera Raw ship with a profile for that lens for Canon... Two, actually -- one with OS and one without. If you manually select Sigma as the make in the Lens Corrections panel, do you see it in the Model pulldown?