Canon Patent: RF 16-28mm Lens That Might Be f/2.8 or f/2.8-4 or f/4

Here is a Canon patent application for a lens that might hit the shelves, sooner or later: RF 16-28mm.

Canon patent application 2022112179 (Japan) discusses optical formulas for an RF 16-28mm lens. Three optical formulas are discussed in the patent literature:

• RF 16-28mm f/2.8
• RF 16-28mm f/2.8-4
• RF 16-28mm f/4

From the patent literature:

A zoom lens that is compact and has a wide angle of view while achieving high optical performance with little variation in aberration during zooming, and an imaging device and an imaging system having the zoom lens.

A photographing lens with a half angle of view exceeding 35 degrees is called a wide-angle lens, and is suitable for photographing a vast landscape by taking advantage of the wide angle of view. A wide-angle lens needs to satisfactorily correct distortion and curvature of field, which worsen as the half angle of view increases.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a zoom lens which is compact and has a wide angle of view, and which can obtain high optical performance with little aberration fluctuation during zooming, and an image pickup apparatus having the zoom lens.

Example 1

• Focal length: 16.45-27.50
• F-value: 2.88
• Half angle of view: 52.70-39.08
• Image height: 19.00-21.64
• Total length: 138.01-127.30
• Back focus: 14.00

Example 2

• Focal length: 16.45-27.50
• F-value: 2.88-4.00
• Half angle of view: 52.740-38.91
• Image height: 19.00-21.64
• Overall length: 121.56-117.50
• Back focus: 14.21

Example 3

• Focal length: 16.45-27.50
• F-value: 4.10
• Half angle of view: 52.69-39.09
• Image height: 19.00-21.64
• Overall length: 124.60-121.49
• Back focus: 14.08

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

• RF 16-28mm lens with either f/2.8, f/2.8-4, or f/4
• 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]