Canon Patent: 14mm, 16mm, 18mm, 20mm f/2.8 Lenses For Mirrorless System

A new week, a new Canon patent application. Like prime lenses? Here are a bunch that might be available soon.

Canon patent application P2022085382 (Japan) discusses optical formulas for the following prime lenses for the RF mount:

• 14mm f/2.8
• 16mm f/2.8
• 18mm f/2.8
• 20mm f/2.8

PROBLEM TO BE SOLVED: To provide an optical system having high optical performance in a small size and light weight in a wide-angle lens, and an image pickup apparatus having the same.

BACKGROUND ART: As a shooting optical system having a wide shooting angle, an optical system having a negative refractive power is arranged on the object side, and an optical system having a positive refractive power is arranged on the image side, so-called retrofocus. A type of photographic optical system is known and is used, for example, in a single focus wide-angle lens.

Further, in digital cameras and video cameras, the number of pixels of solid-state image sensors such as CCDs and CMOS sensors is increasing, and high optical performance including chromatic aberration is required for photographing lenses, and miniaturization is also progressing.

In recent years, in a wide-angle lens system used in an image pickup apparatus, a wide angle of view is required in order to enable shooting in a wider range while the entire lens is small.

Generally, in a wide-angle lens, a wide angle of view is realized by arranging an optical system having a negative refractive power on the object side. In order to widen the angle of view, it is necessary to increase the negative refractive power on the object side, but as the radius of curvature of the lens becomes smaller, the lens processing accuracy deteriorates and the image generated mainly by off-axis rays It causes curvature of field and deterioration of chromatic aberration of magnification. In order to solve these problems, it is necessary to increase the lens diameter on the object side and increase the number of lenses, which is not preferable. In order to reduce the lens diameter, widen the angle of view, and achieve high optical performance, it is necessary to properly arrange the aperture and appropriately arrange the negative refractive power of the optical system arranged on the object side of the aperture. You will need it.

Example 1

• Focal length: 18.20
• F value: 2.90
• Half angle of view: 45.00
• Image height: 18.20
• Overall length: 63.45
• Back focus: 12.94

Example 2

• Focal length: 14.28
• F value: 2.91
• Half angle of view: 51.88
• Image height: 18.20
• Overall length: 57.50
• Back focus: 10.97

Example 3

• Focal length: 16.48
• F value: 2.90
• Half angle of view: 47.84
• Image height: 18.20
• Overall length: 63.19
• Back focus: 12.54

Example 4

• Focal length: 20.10
• F value: 2.91
• Half angle of view: 42.16
• Image height: 18.20
• Overall length: 63.55
• Back focus: 14.51

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

• Automatic shutter silencing based on subject and distance
• A bunch of prime lenses for the RF mount
• An improved Electronic Viewfinder
• Patent application for RF 50mm F1.4 and an RF 35mm f/1.4 lenses
• A zoom lens that might be for an EOS R with APS-C sensor
• A smaller IBIS unit.
• A cooling adapter for the RF mount (R5 overheating?)
• A bunch of macro lenses for the RF mount.
• A 8mm f/4 circular fisheye lens for the Canon EOS R system
• A battery grip that works with differently siszed cameras
• A 100-400mm f/5.5-7.1 lens for APS-C cameras. EOS M or DSLR?
• RF 17-70mm lens for EOS R system
• IBIS coming to the EOS M and PowerShot lineup?
• Patent Application: mirrorless camera with large display and virtual control wheel
• Patent Application: IBIS and Lens IS Working Together
• Patent application for high speed mirror movement and control
• Patent application for an RF 14-28mm f/2 lens
• Patent application for an RF 50mm f/1.8 lens
• Patent application for a smart lens cap
• Patent application for celestial auto-focus
• Patent application describing a Pop-Up Flash With LED
• Patent application describing the optical formula for a RF 70-300mm F/4-5.6 IS lens for EOS R systems
• Patent application describing how to improve burst rate by compressing raw files
• Patent application describing a new way to review photos from a sequential shot
• Patent application that describes technology to improve wireless communication while reducing power consumption
• Patent application to spot and reduce moire artefacts in image data
• Patent application for weather sealed lens adapter
• Patent application for AI powered predictive camera control system
• Patent application for 18-55mm kit lens with LCD display
• Patent application to reduce noise in image files

[via asobinet.com]