Canon has filed several new compact and lightweight zoom lens patents for RF 70-300mm f/4.5-7.2, RF 100-350mm f/5-8, RF 250-600mm f/6.3-11 lenses that are designed for Canon RF-mount full-frame mirrorless cameras.
[Publication number] JP-A-2022-178447
[Publication date] 2022.12.2
[Patent application title] Zoom lens and imaging device having the same
From the patent literature:
A zoom lens is provided which is compact and lightweight and capable of achieving high optical performance over the entire zoom range and all object distances.
More details of the new Canon Patents for full-frame mirrorless cameras can be found below.
Example 1 (100-400mm F6.3-8)
Focal length: 103.01 201.88 387.98
F number: 6.30 8.24 8.24
Half angle of view: 11.86 6.12 3.19
Image height: 21.64 21.64 21.64
Total lens length: 183.99 229.42 280.32 122.00 122.00 122.00
Back focus: 7
Example 2 (100-350mm F5-8)
Focal length: 103.01 208.71 347.20
F number: 5.13 7.06 8.24
Half angle of view: 11.86 5.92 3.57
Image height: 21.64 21.64 21.64
Total lens length: 198.72 238.36 267.39 863.99 863.94
Back focus: 362.94
Example 3 (70-300mm F4.5-7.2)
Focal length: 70.00 146.89 300.00
F number: 4.40 6.09 7.20
Half angle of view: 17.17 8.38 4.12
Image height: 21.64 21.64 21.64
Total length of lens: 165.01 196.65 231.62 232.29 232.322
Example 5 (250-600mm F6.3-11)
Focal length: 250.00 439.53 600.00
F number: 6.24 9.67 11.33
Half angle of view: 4.95 2.82 2.07
Image height: 21.64 21.64 21.64
Total length of lens: 305.44 320.00 923.07 916.37 336.37
Back focus: 316.97