Canon Patent for RF 13-21mm f/2.8L Lens for EOS R System

Here is another patent application of a wide-angle zoom RF lens for the Canon EOS R full frame mirrorless system. The product is the Canon RF 13-21mm f/2.8L Lens.

We already have the latest Canon RF 15-35mm F2.8 L IS USM lens which is a ultra-wide-angle zoom lens for Canon’s full frame mirrorless system cameras such as EOS R and EOS RP.

Now a new Canon patent application P2020-30251A (Japan) discusses optical formulas for a RF 13-21mm f/2.8L lens for a full frame mirrorless camera system, i.e. for the EOS R system.

Canon RF 15-35mm f/2.8L IS USM Lens – $2,299.00 – Order at  Amazon, B&H, Adorama

Canon RF 13-21mm f/2.8L Lens Patent

• Zoom ratio: 1.58
• Focal length: 13.40 17.30 21.20 mm
• F number: 2.88 2.88 2.88
• Half angle of view: 58.23 51.35 45.58
• Image height: 21.64 21.64 21.64 mm
• Lens length: 150.15 136.89 130.04 mm
• Back focus: 20.96 25.13 29.31 mm

The Canon RF mount has the same 54mm diameter, but boasts a flange focal distance (the space between the lens and the sensor) of 20mm (24mm shorter than that of the EF/EF-S mount, thanks to the lack of mirror) and 12 electrical contacts (4 more than EF/EF-S, providing faster communication).

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