Canon Patent: 18-100mm F4 And 14-60mm F4 Lenses

Another Canon patent application today, for a 18-100mm f/4 lens and a 14-60mm f/4 lens.

Canon patent application 2023018409 (Japan, published 2/8/2023) discusses optical formulas for two lenses we think are for the RF mount, 18-100mm f/4 and a 14-60mm f/4.

From the patent literature:

To provide a zoom lens that is compatible with a short back and suppresses variations in optical performance due to focusing in a wide-angle range with a wide angle of view.

Description of the Related Art

There is a demand for a compact and lightweight zoom lens compatible with a so-called mirrorless camera without a quick return mirror. For example, it consists of a first lens group with positive refractive power, a second lens group with negative refractive power, and a subsequent group including a plurality of lens groups, arranged in order from the object side to the image side, and the second lens group is the main lens group. A zoom lens with a variable power group is known (.

Further, in recent years, in order to reduce the size of the zoom lens, an imaging apparatus has been proposed that electrically corrects distortion mainly in a wide-angle range among various aberrations of a zoom lens. However, in such an image pickup apparatus, field curvature fluctuations, in particular, become large as aberration fluctuations during focusing.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a zoom lens that is compatible with shortback and suppresses fluctuations in optical performance due to focusing in a wide-angle range with a wide angle of view, and an imaging apparatus and an imaging system having the zoom lens.

Example 1

• Focal length: 15.45-68.00
• F-value: 4.12
• Half angle of view: 36.92-11.36
• Total length: 106.58-125.20
• Back focus: 10.68-12.16

Example 2

• Focal length: 13.40-63.10
• F-value: 4.12
• Half angle of view: 40.91-12.22
• Overall length: 105.91-129.46
• Back focus: 11.16

Example 3

• Focal length: 18.00-88.20
• F-value: 4.12
• Half angle of view: 32.82-8.80
• Total length: 108.02-127.32
• Back focus: 11.42

More Canon patent applications are listed here.

[via asobinet]