I calibrated my fisheye zoom lens! after 4 years of manual geometric correction, thinking this was the best for this special kind of a lens, I decided to look if there was any geometric distortion profiles available, and there was none!!! even by the manufacturer .. I took the initiative, downloaded Adobe Lens Profile Creator, printed my calibration chart, spent 5 hours getting it right, shooting on every single focal distance, and started the calibration! OMG, I now love my lens even more!! and feel how silly I was wasting all this time in manual correction. advice to all photographers "specially architecture and indoor photographers" who has an ultra wide or fisheye lens CALIBRATE your baby ! but first check if your lens profile is available at Adobe lens profile downloader, before spending your time.