Some more details have emerged just before the release date of the Sigma 12mm f1.4. This lens will be available for the Canon RF mount as well as Fuji, L-mount, and Sony E-mount. We previously talked about this back in June, and finally, we have some more information. This will be a nice, fast ultra-wide lens for those who want to use a smaller camera and perhaps dabble in astrolandscape photography. The optical formula is relatively complex at 12 groups and 14 elements, and includes a 9-blade aperture. The Canon RF mount lens will also feature a control ring.