Canon has announced two new telephoto prime lenses for the RF mount. The RF 400mm F2.8L IS USM and 600mm F4L IS USM have the same optical makeup as their EF-mount equivalents, with 17 elements in 13 groups, including one Super UD and two fluorite special elements, along with Super Spectra and Air Sphere coatings. Canon claims that the optical I.S. systems reduce camera shake by up to 5.5 stops regardless of which RF-mount body you’re using.
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