Canon said in the patent:
Summary of the Invention A zoom lens, an image pickup device and an optical system.
The problem to be solved is to provide a zoom lens, an image pickup device and an optical system with the zoom lens, which can support high-magnification telephoto zoom and has good optical performance in the whole zoom range.
Because the mirrorless camera does not need space to arrange the quick return mirror, it does not need to ensure the back focal length like the traditional interchangeable lens. Therefore, different from the previous interchangeable lens, the design freedom of lens structure is increased, and a small and light lens can be designed.
Especially, the back focal length of telephoto lens is easy to become longer, but by shortening the back focal length of the wide-angle end of telephoto zoom lens, the miniaturization of the interchangeable lens of mirrorless camera can be realized.
I. Example 1(60-600 mm F4.5-8)
Scaling ratio 9.5 1
The focal length is 6 1.50mm, 164.60mm, 585.00 mm
The f numbers are 4.46, 5.94 and 8. 16 respectively.
Half angle of view () 19.38, 7.49, 2. 12
The total length of the lens is 258.90mm, 302.70mm and 346.50mm..
The back focal length is 30.00mm, 49.79mm and 90.50 mm
Second, the second example (60-600mm F4.5-8)
Scaling ratio 9.5 1
The focal length is 6 1.50mm, 164.6 1mm, 585.00 mm
The f number is 4.65, 6.20, 8. 16.
Half angle of view () 19.38, 7.49, 2. 12
The total length of the lens is 265.69mm, 309.49mm and 353.29 mm respectively.
The back focal length is 30.00mm, 50.76mm and 90.33 mm
Three. Example 3(70-700 mm F4.5-8)
Zoom ratio 9.74
The focal length is 70.00mm, 185.35mm and 682.00.00 mm
The f number is 4.76, 6.20, 8. 16.
Half viewing angle () 17. 18, 6.66, 1.82
The total length of the lens is 27 1.00mm, 3 16.00mm and 361.00 mm.
The back focal length is 3 1.22mm, 50.94mm and 97.50mm..
Four. Example 4(80-800 mm F5-9)
Scaling ratio 9.6 1
The focal length is 8 1.60mm, 2 1 1.55mm and 784.00mm
The f numbers are 5.23, 6.70 and 9. 18 respectively.
Half viewing angle () 14.85, 5.84, 1.58.
The total length of the lens is 274.33mm, 322.67mm, 37 1.05438+0mm.
The back focal length is 32.48mm, 5 1.83mm,105.97 mm.
Verb (abbreviation of verb) Example 5(60-600 mm F4.5-8)
Scaling ratio 9.5 1
The focal length is 6 1.50mm, 164. 14mm, 585.00 mm
The f numbers are 4.67, 6.20, 8. 16.
Half viewing angle () 19.38, 7.5 1, 2. 12.
The total length of the lens is 258.90mm, 302.70mm and 346.50mm..
The back focal length is 30.50mm, 49. 13mm, 88.03 mm
Example 6 of intransitive verb (60-600 mm F4.5-8)
Scaling ratio 9.5 1
The focal length is 6 1.50mm, 164.6 1mm, 585.00 mm
The f number is 4.65, 6.20, 8. 16.
Half viewing angle () 19.38, 7.50, 2. 12
The total length of the lens is 258.90mm, 30 1.86mm and 3438+0 mm.
The back focal length is 30.00mm, 49.89mm and 89.39 mm
It seems that Canon may consider introducing a super telephoto high magnification zoom lens similar to Sigma 60-600 mm ... with a total length of about 23.9 cm to 25.4 cm, giving people the impression that its specifications are quite compact. Blessed is the old mage who shoots birds.