Canon filed a patent applications today. They provide high optical performance over the entire zoom range in a compact and lightweight design. The examples cited in the paten include the RF 9-18mm F/4 and the RF10-18mm F/4.
Applicant: Canon Inc.
Publication number: P2023099389
Application number: P 2022000016
Publication date: 2023-07-13
Invention title: Zoom lens and imaging device having the same
The following is machine translated from IP Force
Provides a compact and lightweight zoom lens with a wide angle of view and high optical performance throughout the zoom range is disclosed.
In recent years, zoom lenses used in imaging apparatuses are required to have a wide angle of view and high optical performance as imaging apparatuses have become more sophisticated. As a zoom lens with a wide angle of view at the wide-angle end, a negative lead type zoom lens in which a lens group with negative refractive power precedes is known.
To achieve a compact and lightweight zoom lens that maintains high optical performance across the entire zoom range while providing a wide angle of view, it is crucial to appropriately determine the refractive power and lens configuration of the first lens group, as well as the refractive power of the subsequent lens groups.
SUMMARY OF THE INVENTION The objective of the present invention is to provide an anonymized compact and lightweight zoom lens with a wide angle of view and high optical performance throughout the entire zoom range, along with an imaging apparatus incorporating the aforementioned zoom lens.
Example 1 (9-18mm F4)
Zoom ratio 1.88
Focal length 9.27 13.03 17.46
F value 4.12 4.12 4.12
Half angle of view 63.98 56.92 51.10
Image height 19.00 20.00 21.64
Total length 108.47 102.77 100.80
Back focus 15.71 19.67 23.00
Example 4 (10-18mm F4)
Zoom ratio 1.74
Wide angle Medium Telephoto
focal length 10.01 13.27 17.46
F number 4.12 4.12 4.12
Half angle of view (°) 62.23 56.44 51.10
Image height 19.00 20.00 21.64
Lens length 110.09 10 4.20 100.83
BF 15.91 15.91 15.91
A patent application does not mean we will see these focal lengths with either of the lens embodiments found within the patent. However, it serves to protect Canon's research and development efforts. But an RF 10-18mm f/2.8 would be appreciate.
