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Canon Patent Application: Canon RF 28-70 2.2 - 2.8
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Canon Patent Application: Canon RF 28-70 2.2 - 2.8

A continued flurry of patents these last months on RF lenses, and this is another exotic one.

This patent application is for a 28-70, 2.2 - 2.8 full frame lens.  This isn't the amazing 28-70 2.0 lens, but another variant, perhaps "lighter" .. it's certainly smaller, only having a relative lens length of around 155mm.

For those that may be wondering why we are finding so many RF lens patents, it makes sense, Canon had 20 years of EF lens patents to draw from when they create an EF lens, and they are constantly improving on those lens designs, the RF system is starting from scratch, and Canon would want to quickly patent up their unique ideas for RF mount lenses.

The lens embodiments are shown below;

Focal distance      28.84  44.14  67.90 
F number             2.25   2.62   2.91 
a half field angle  36.88  26.11  17.67 
Image height        21.64  21.64  21.64 
length of the lens 146.94 157.60 175.00 
BF                  20.75  28.77  34.64 

Focal distance      28.82  44.24  67.90 
F number             2.27   2.63   2.91 
a half field angle  36.90  26.06  17.67 
Image height        21.64  21.64  21.64 
length of the lens 150.08 159.44 174.76 
BF                  20.56  29.08  35.42 

Japan Patent Application 2018-197774

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