[Dan K] had just such a lens from Sigma, but wanted to get it working fully with a camera using the Canon EF lens fitting. Hacking ensued. The lens in question was a Sigma 15-30mm f/3.5-4.5 EX DG ...
(From Canon lens literature) Designed to satisfy the discriminating needs of sports and wildlife photographers, the EF 200–400mm f/4L IS USM Extender 1.4X is a high-performance super telephoto ...
In summary, the Canon EF 400mm f/2.8L IS III USM lens is a superb performer. You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.
The Canon 6D is available body-only, or bundled with the EF 24-105mm f/4L IS USM "kit" lens. The test images shown on most other pages of this review were taken with very sharp references lenses ...
These lenses are already available for L-Mount, Sony E-mount, Fujifilm X-Mount, Nikon Z Mount (excluding the 23mm), Canon EF-M Mount and ... Supplied Accessories: LENS HOOD LH586-01, FRONT CAP ...