There is a 10 mm F/3.5 Samyang XP Premium lens in my collection, and so far, from F/5.6 it is not only excellent, but did beat anything else in that UWA-bracket, including the Voightlander 10 mm F/5.6. It is big, and I use it with an adapter for my EOS-R, but I really dig it.
Wasn't cheap, and I do not know whether it still is in production, but I find it very useful for indoor shooting and landscapes. It has become one of my top 3 prime lenses since I got it about 4 or 5 years ago.
What is really awesome is that from F/5.6, the light fall-off is well under control, and corner sharpness is actually quite good, compared to anything else I have tried, and that includes the Canon 11-24L.
It's auto-aperture, and manual focus, but with the focusing options on the R it is just fine, although not a lot of focusing is required, really.
Wasn't cheap, and I do not know whether it still is in production, but I find it very useful for indoor shooting and landscapes. It has become one of my top 3 prime lenses since I got it about 4 or 5 years ago.
What is really awesome is that from F/5.6, the light fall-off is well under control, and corner sharpness is actually quite good, compared to anything else I have tried, and that includes the Canon 11-24L.
It's auto-aperture, and manual focus, but with the focusing options on the R it is just fine, although not a lot of focusing is required, really.
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 ....
