Canon will be officially announcing an RF 400mm f/2.8L IS USM super-telephoto lens. This lens is optically identical to the EF 400mm f/2.8L IS USM III. I do wonder if this and the RF 600mm f/4L IS USM will be stopgaps while Canon designs new super-telephoto lenses to take full advantage of the RF mount.
The Canon RF 400mm f/2.8L IS USM will launch at $11,999 USD.
Below is official Canon information about the RF 400mm f/2.8L IS USM.
High-performance, Wide-aperture 400mm f/2.8 Super-telephoto Lens, Exclusively for EOS R-series cameras
Inheriting the optics of the EF 400mm f/2.8L IS III USM, the same high image quality is maintained in the RF400mm F2.8 L IS USM with outstanding sharpness and contrast, center to corner, even at maximum aperture. A combination of Fluorite and Super UD (Ultra-low Dispersion) glass is at the heart of this lens’s outstanding optical performance. At the widest aperture of f/2.8, chromatic aberration is significantly reduced, to achieve tack-sharp images...
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