Vignetting is not preventable on such wide rectilinear lenses, although distortion like that is not really necessary, considering my 10 mm F/3.5 Samyang, and vignetting is virtually unnoticeable at F/5.6.
I would be really disappointed if the new Canon isn't close to the Samyang in IQ. Based on the sample images vignetting is still apparent at F/5.6, although not bad. I am more worried about edge and corner sharpness, which was not all that great with the EF 11-24L at 11 mm. In the sample images there is no good example to draw any conclusions from however, they are just way too small. The one of the house with pool appears to be OK, but that is taken at F/13,but it does not indicate the FL used.
BTW, the sharpness of the Samyang in the corners plus lack of distortion were the main reasons for me to go for the Samyang 10 rather than the Canon 11-24 at the time ....
I would be really disappointed if the new Canon isn't close to the Samyang in IQ. Based on the sample images vignetting is still apparent at F/5.6, although not bad. I am more worried about edge and corner sharpness, which was not all that great with the EF 11-24L at 11 mm. In the sample images there is no good example to draw any conclusions from however, they are just way too small. The one of the house with pool appears to be OK, but that is taken at F/13,but it does not indicate the FL used.
BTW, the sharpness of the Samyang in the corners plus lack of distortion were the main reasons for me to go for the Samyang 10 rather than the Canon 11-24 at the time ....
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....