I just did my first custom profile and it was fairly painless. However, since it was on a fisheye lens, I'm trying to figure out how to make the calibration ignore the curvature and just fix things like CA and vignetting. What it did was convert it into a rectilinear image, which isn't what I want. My guess is that Geometric Distortion Model needs to be unchecked, but that is grayed out.
Thanks,
Mark