Canon has released patents for several ultra-telephoto lenses, including "60-600mm F4.5-8", "70-700mm F4.7-8" and "80-800mm F5-9" "High-power zoom patent. Patent Publication Number: P2022053697
Canon stated in the patent:
Contents of the invention: zoom lens and image pickup device and optical system.
Problem to be solved: Provide a zoom lens capable of supporting high-magnification telephoto zoom and having good optical performance throughout the entire zoom range, an image pickup device and an optical system having the zoom lens.
Since mirrorless cameras do not require space for a quick-return mirror, there is no need to ensure back focus like traditional interchangeable lenses. Therefore, unlike conventional interchangeable lenses, the design freedom of the lens structure increases, enabling the design of a compact and lightweight lens.
In particular, the back focal length of a telephoto lens tends to become longer, but by making the back focal length shorter at the wide-angle end of a telephoto zoom lens, interchangeable lenses for mirrorless cameras can be miniaturized.
1. Example 1 (60-600mm F4.5-8)
Zoom ratio 9.51
Focal length 61.50mm, 164.60mm, 585.00mm
F number 4.46, 5.94, 8.16
Half angle of view ( ) 19.38, 7.49, 2.12
Total lens length 258.90mm, 302.70mm, 346.50mm
< p> Back focal length 30.00mm, 49.79mm, 90.50mm2. Example 2 (60-600mm F4.5-8)
Zoom ratio 9.51
Focal length 61.50mm, 164.61mm, 585.00mm
F number 4.65, 6.20, 8.16
Half viewing angle ( ) 19.38, 7.49, 2.12
Total lens length 265.69 mm, 309.49mm, 353.29mm
Back focal length 30.00mm, 50.76mm, 90.33mm
3. Example 3 (70-700mm F4.5-8)
< p> Zoom ratio 9.74Focal length 70.00mm, 185.35mm, 682.00.00mm
F number 4.76, 6.20, 8.16
Half viewing angle ( ) 17.18, 6.66 , 1.82
The total length of the lens is 271.00mm, 316.00mm, 361.00mm
The back focal length is 31.22mm, 50.94mm, 97.50mm
4. Example 4 (80 -800mm F5-9)
Zoom ratio 9.61
Focal length 81.60mm, 211.55mm, 784.00mm
F number 5.23, 6.70, 9.18
Half viewing angle ( ) 14.85, 5.84, 1.58
Lens total length 274.33mm, 322.67mm, 371.01mm
Back focal length 32.48mm, 51.83mm, 105.97mm
5. Example 5 (60-600mm F4.5-8)
Zoom ratio 9.51
Focal length 61.50mm, 164.14mm, 585.00mm
F number 4.67, 6.20, 8.16
Half angle of view ( ) 19.38, 7.51, 2.12
Lens total length 258.90mm, 302.70mm, 346.50mm
Rear Focal length 30.50mm, 49.13mm, 88.03mm
6. Example 6 (60-600mm F4.5-8)
Zoom ratio 9.51
Focal length 61.50mm , 164.61mm, 585.00mm
F number 4.65, 6.20, 8.16
Half angle of view ( ) 19.38, 7.50, 2.12
Total lens length 258.90mm, 301.86 mm, 344.
81mm
Back focal length 30.00mm, 49.89mm, 89.39mm
It seems that Canon may consider launching a super telephoto high-power zoom lens like the Sigma 60-600mm. The overall length is approximately 23.9cm to 25.4cm, giving the impression of being quite compact in size. Blessed is the old mage who shoots birds.