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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. The Sigma 12mm will also feature weather sealing and should be a perfect complement to Canon's higher-end APS-C cameras, such as the EOS R7.

This latest addition to the Sigma RF lineup will make it a nice 5-lens prime kit of f/1.4 primes from Sigma that will include primes of 12, 16, 23, 30, and 55mm. The 12mm is not going to be inexpensive, with the price expected to be around $700 USD for the prime lens. Then again, for a 12mm f/1.4 – this is a rather unique lens, that requires an above-average price.
Tomorrow, Sigma should be announcing two lenses. The Sigma 200mm F2 DG OS and 12mm f/1.4 DC DN are expected to launch.
Sigma's APS-C prime lenses are pretty good, and this lens should be no exception. I look forward to the announcement tomorrow. While they are certainly niche lenses, having more options is never a bad thing.

Sigma 12mm f/1.4 DC Specifications
| Lens mount | E/X/L/RF |
| Compatible sensors | APS-C |
| focal length | 12mm |
| Lens construction | 14 elements in 12 groups |
| Maximum aperture | F1.4 |
| Minimum aperture | F16 |
| Aperture blades | 9 blades |
| Minimum focusing distance | 17.2cm |
| Maximum magnification | 1:8. |
| Filter diameter | 62mm |
| Image stabilization | – |
| Teleconverter | – |
| coating | Water and oil repellent |
| size | φ68.0×69.4mm |
| weight | 225g |
| Dustproof and waterproof | Simple |
| AF | STM |
| Aperture ring | Equipped (except RF mount) |
| Other controls | Control ring (RF mount) |
| accessories | Lens cap hood |


FFFFuck Canon
Would they still be willing to wait if they added a fee and allowed it? Probably they would skip to another manufacturer.
I think with "normal" prime lenses with very good optics, it's not a bad choice going with these SIGMA's. They're built well, don't weigh a lot and the full frame Canon primes of good/great image quality are big, heavy and expensive. (The VCM's are good value for what they cost).
I like having a seperate carry everywhere small camera and lens/lenses.