Canon Patent: RF 70-300mm f/4.5-7.2 & RF 250-600mm f/6.3-11

A new Canon patent, and once more more for RF mount lenses (what else?).

Canon patent application 2022178447 (Japan, published 12/2/2022) discusses optical formulas for two zoom lenses for the RF mount:

• RF 70-300mm f/4.5-7.2
• RF 250-600mm f/6.3-11

From the patent literature:

A compact and lightweight zoom lens that has high optical performance over the entire zoom range is provided.

Description of the Related Art

In recent years, zoom lenses used in image pickup apparatuses are required to have high optical performance and to be compact and lightweight.

As a zoom lens that meets these requirements, Patent Document 1 discloses a zoom lens having first to fourth lens groups with positive, negative, positive, and positive refractive powers arranged in order from the object side to the image side, A zoom lens is disclosed in which the spacing between adjacent lens groups changes during zooming.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a compact and lightweight zoom lens that has high optical performance over the entire zoom range, and an imaging apparatus having the zoom lens.

Example 1

• Focal length: 103.01-387.98
• F-value: 6.30-8.24
• Half angle of view: 11.86-3.19
• Image height: 21.64
• Total length: 183.99-280.00
• Back focus: 32.00-122.21

Example 2

• Focal length: 103.01-347.20
• F-value: 5.13-8.24
• Half angle of view: 11.86-3.57
• Image height: 21.64
• Overall length: 198.72-267.94
• Back focus: 32.86-136.99

Example 3

• Focal length: 70.00-300.00
• F-value: 4.40-7.20
• Half angle of view: 17.17-4.12
• Image height: 21.64
• Total length: 165.01-231.87
• Back focus: 27.80-102.92

Example 4

• Focal length: 250.00-600.00
• F-value: 6.24-11.33
• Half angle of view: 4.95-2.07
• Image height: 21.64
• Overall length: 305.44-336.20
• Back focus: 29.45-163.77

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]