Flare is one area where diffractive elements could have a negative effect, but by facing the diffraction gratings against each other, Canon seems ... just -0.3 EV. An 800mm lens is difficult ...

No, that accolade went to Canon with its RF 200-800mm F6.3-9 IS USM in 2023. There's plenty going for the 400-800mm lens, mind. Sony says it is dust-resistant and moisture-resistant, plus its ...

Canon has been making cameras for professionals and hobbyists for a very long time, and the EF lens mount that it introduced ... offering a mighty 800mm. Its aperture value of f/9 at the long ...

[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 ...