Awesome lens .... https://opticallimits.com/canon/canon-rf/canon-rf-10-20mm-f-4-l-is-stm-review/
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
12 EV down to 2 EV? I suppose the extreme corners are mostly noise... or not?
stoppingdown.net
Sony a6300, Sony a6000, Sony NEX-6, Sony E 10-18mm F4 OSS, Sony Zeiss Vario-Tessar T* E 16-70mm F4 ZA OSS, Sony FE 70-200mm F4 G OSS, Sigma 150-600mm Æ’/5-6.3 DG OS HSM Contemporary, Samyang 12mm Æ’/2, Sigma 30mm F2.8 DN | A, Meyer Gorlitz Trioplan 100mm Æ’/2.8, Samyang 8mm Æ’/3.5 fish-eye II | Zenit Helios 44-2 58mm Æ’/2
Plus some legacy Nikkor lenses.
With the distortion correction, they're just cut off, mostly.