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 ...

Borderless printing is possible on glossy or fine art paper, and there's the option to print panoramas of up to 1,800mm long. Canon rates print speed at 4 minutes 15 seconds for an A3+ print with ...