OpenCV doesn't work with 200° FOV camera ?

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Hello guys.

I've been trying to understand OpenCV for months and I think it was all for nothing.

I have a very wide angle fisheye camera (200 degrees or so) and would like to calibrate it.

I've tried with 27 good pictures but I get really awkward results for calibration, especially for the pictures where the pattern is near the edges. When I calibrate (using fisheye of course), the points on the edges are projected to infinity, and the points in the center are still not 100% accurate...

I also had to disable the CALIB_CHECK_COND because of some images (where checkerboard is beyond 180°). I don't know what to do. After all the time I spent trying to learn OpenCV, do I have to throw all of it away and code my own functions ?

Is the pinhole model still accurate for my camera ?

(I've been searching for 2 hours on Google and found nothing)