Canon Patent for RF 135mm F/1.8L USM
By Linky Johnson 2019-06-05 591 0
The following information about the lens is presented:
Canon RF 135mm f / 1.8L USM:
1) Focal length: 133.0 mm
2) Maximum aperture: 1.80
3) Half angle of view: 9.2°
4) Image height: 21.6 mm
5) Total lens length: 150 mm
6) BF: 18 mm
The patent contains a drawing of the optical circuit of the lens:
In addition, there are other lenses in the patent documentation. For example, Canon RF 85mm f/1.2L USM (which is already announced) together with Canon RF 100mm f/1.4 prime lens.
The source notes that the RF 135mm F/1.8 lens is more likely to output than RF 100mm F/1.4.
Earlier, Canon patented two ultra-wide-angle zoom lenses for the EOS R system. They were two lenses: Canon RF 17-35mm f / 4-5.6 with different optical design.
Another recent Canon patent is the dual teleconverter built into the Canon EF 400mm f/5.6 lens. One of the teleconverters reduces the focal length, and the built-in FR converter converts the lens to the EF 300mm F/4 or EF 560mm F/8.
By the way, Canon will release RF 135mm f/1.8L lens in 2020.
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