Factor in powerful Image Stabilizers, and you've got a brace of super-telephotos that are practical to use handheld, as well as a highly mobile solution for tripod or monopod work. The innovative optical arrangement of the Canon RF 800mm F5.6L IS USM and RF 1200mm F8L IS USM means that the weight of the lenses is distributed more centrally compared with their front-heavy EF counterparts. Superior super-telephoto build quality and handling We have also applied a fluorine coating to the front of the lens so that it is easy to remove any dirt and dust that adheres to the surface of the glass." "In addition to this, ASC coating that significantly suppresses flare and ghosting is used in those parts of the lenses that have been inherited from the RF 400mm F2.8L IS USM and RF 600mm F4L IS USM. To correct for chromatic aberration and ensure a high-quality image, a UD lens element has been incorporated into the design of the new magnification optics, explains Optical Designer Tomohiro Ino. Putting the magnification optics at the back, nearer the camera sensor, means that the optics no longer need to be, say, 160mm in diameter, which massively reduces the weight and size."
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"In the past, these big magnifying optics have been at the front of the lens, with the focusing group at the back," says Canon Europe's Senior Professional Imaging Product Specialist, Mike Burnhill, "but with the RF 800mm F5.6L IS USM and RF 1200mm F8L IS USM we've essentially flipped it around.
But moving the new magnification optics closer to the camera enables the RF 800mm F5.6L IS USM to be much smaller and lighter than the Canon EF 800mm f/5.6L IS USM. The front half of the lens shares similar functionalities with the Canon RF 400mm F2.8L IS USM and it is compatible with the same lens hoods and accessories. It's a similar story with the Canon RF 800mm F5.6L IS USM.
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