And look no further. The best fisheye correction you can get is here. DXO analyze the different lenses in detail. On the specified camera. So you need to check if they have a module for your lens / camera combination. But if they have, DXO does the best corrections possible.
My original image
Corrected with DXO Optics pro
Corrected with DXO Optics Pro with new aspect
All sorts of corrections
I’ve just scratched the surface of this program. It does all kinds of advanced corrections. Here is my old test image from the 50mm f1.4.
Original 100% crop at f1.4
Any chance that DXO can do something with this total mess of optic errors?
100% crop at f1.4 corrected with DXO
Pretty impressive! But before you run out buying crappy lenses thinking that you can save everything in DXO, have a look at the same image snapped at f5.6:
Proper optics out there in the field is the best way to go. But so far I’m impressed with DXO. It’s worth the fisheye correction on my 15mm alone!