The Sigma 15 mm F2.8 FE lens is designed for full-frame cameras. What camera model are you using it on? If it is a "crop" body then it should also work fine with the lens profile since it automatically scales the correction to your camera's crop factor. I use PS's Adaptive wide angle filter and Fisheye-Hemi plugin with my Canon 8-15mm FE to correct (or partially correct) the FE curvature and it works very well. There are also numerous freeware apps such as Hugin for processing FE images and creating panoramas.
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