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Canon has announced a pair of super-telephoto fixed-aperture lenses: the RF 600mm F11 IS STM and RF 800mm F11 IS STM.
The use of gapless dual-layer diffractive optics and fixed apertures of F11 allowed Canon to reduce the size and length of the lenses compared to their EF equivalents. Canon also says the design of the DO elements also allows for much lower pricing than would otherwise be possible. Both lenses are collapsable, which reduces their length by around 25%. Neither is weather-sealed.
The design of the DO elements also allows for much lower pricing
The image stabilization on the lenses reduces shake by five stops on the 600mm and four stops on the 800mm. Canon does not claim any additional image stabilization advantage when using the IBIS systems in the newly launched EOS R5 and R6. Both lenses use stepping motors to drive their focus groups, so focus is unlikely to match the speeds and silence of the company`s lenses using Nano USM motors. When attached to the R5 and R6, AF coverage area is 60% x 40% (W x H).
The RF 1.4x and 2x will give the 600mm F11 and 800mm F11 even more reach
Canon has also introduced a pair of teleconverters alongside the RF lenses released today. The RF 1.4x and 2x will give the 600mm F11 and 800mm F11 even more reach. With the 2x teleconverter attached, the 800mm F11 becomes a 1600mm F22 – and yes, the R5 and R6 can maintain autofocus at that aperture.
The teleconverters are also compatible with the just-announced 100-500mm F4.5-7.1L. Note, however, that the 100-500mm must be set to 300mm or longer before the teleconverter can be attached, so the lens becomes either an effective 420-700mm or a 600-1000mm, depending on which converter you`re using.
The 600mm, 800mm and both converters will be available later this month. The 600mm ...
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