A very interesting Tamron tidbit has appeared on Sony Alpha Rumors – an optics diagram of a patented 200-800mm f/6.7 for Sony ...

Do you use a Canon EOS R mirrorless camera? From wide-angle to telephoto, these are the best lenses we've tested for the platform. Images, and the devices that capture them, are my focus.

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 ...