Canon Patent: RF 70mm F2, RF 70mm F2.8, RF 75mm F2.4, and RF 85mm F2.8

Canon Patent

A new Canon patent application for relatively fast prime lenses.

Canon patent application 2023149130 (Japan, published 10/12/2023) discusses optical formulas for prime lenses for the RF mount:

  • RF 70mm F2
  • RF 70mm F2.8
  • RF 75mm F2.4
  • RF 85mm F2.8

From the patent literature:

  • The present invention provides an optical system that is small and lightweight, yet can satisfactorily correct various aberrations including chromatic aberration and obtain high optical performance, and an imaging device having the same.
  • BACKGROUND ART
    In recent years, there has been a strong demand for optical systems used in imaging devices to have a compact overall lens system and high optical performance including chromatic aberration correction.
  • Generally, in a telephoto type optical system, as the focal length becomes longer, the entire lens system becomes larger and its mass increases. In order to miniaturize the optical system with a telephoto power arrangement, it is effective to strengthen the positive refractive power on the object side and the negative refractive power on the image side, but it is effective to increase the positive refractive power on the object side and the negative refractive power on the image side. Challenges arise in balancing both work and life.
  • Furthermore, in an optical system compatible with a large image sensor, it is important to perform focusing quickly using a small and lightweight lens group, and with less burden on the driving device. In a telephoto optical system, in order to easily perform focusing and to reduce aberration fluctuations during focusing, it is important to appropriately set the lens configuration of each lens group.
  • Patent Document 1 discloses that a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group are arranged in order from the object side to the image side. An optical system is disclosed in which the distance between matching lens groups is varied.
  • However, in the optical system described in Patent Document 1, the number of lenses constituting the optical system is large, and the optical system cannot be sufficiently miniaturized.
  • The present invention provides an optical system that is small and lightweight, yet can satisfactorily correct various aberrations including chromatic aberration and obtain high optical performance, and an imaging device having the same.

Example 1

  • Focal length: 70.00
  • F value: 2.06
  • Half angle of view: 17.17
  • Image height: 21.64
  • Total length: 78.88
  • Back focus: 16.48

Example 2

  • Focal length: 70.00
  • F value: 2.83
  • Half angle of view: 17.17
  • Image height: 21.64
  • Total length: 68.97
  • Back focus: 17.41

Example 3

  • Focal length: 85.00
  • F value: 2.83
  • Half angle of view: 14.28
  • Image height: 21.64
  • Total length: 83.01
  • Back focus: 17.55

Example 4

  • Focal length: 75.00
  • F value: 2.40
  • Half angle of view: 16.09
  • Image height: 21.64
  • Total length: 86.00
  • Back focus: 15.64

More Canon patents are listed here.

[via asobinet]

Is Meike Set To Announce The First Third Party RF Mount Lens With Official AF Support?

Meike

It seems that Chinese manufacturer Meike is going to release the first RF mount lens with Canon-licensed AF implementation, the Meike AF 85mm F1.4.

The is said to get released to the public in August 2023, after the 30th Beijing International Radio, Film and Television Exhibition (BIRTV) on August 23-26, 2023. These are the specifications:

  • Multi-standard, Nikon Z, Sony E
  • 13 elements in 8 groups
  • 77mm filter diameter
  • 12 aperture blades
  • Shortest shooting distance: 0.98m
  • AF/MF selector switch
  • Fn button
  • Weight: 800g
  • E/Z/RF/L mount
  • L-mount AF lens from China
  • in the hands of some photographers
  • Scheduled to be released in August

In a recent interview, Canon execs indeed said they will open the RF mount to third party manufacturers.

[via asobinet]

Yongnuo Might Soon Release A 85mm F1.8R DF DSM Lens For The RF Mount, Rumor

Yongnuo

Rumor has it that lens manufacturer Yongnuo might release a 85mm F1.8R DF DSM lens for the EOS R system.

Asobinet reports:

This lens has a new logo design, a lens configuration of 9 elements in 8 groups, a 7-element aperture, a minimum focusing distance of 0.8m, a 58mm filter, a stepping motor, 67 x 88mm, and approximately 380g.

Well, I hope the rumor is reliable :-)

Today Only: Lensbaby Pro Kit for Canon EF – $799.95 (reg. $1399.95)

Lensbaby

Only for today (12/07/2022) B&H Photo has a whooping $600 discount on the Lensbaby Pro Kit for Canon EF mounts.

At a glance:

  • Velvet 85mm f/1.8 Lens
  • Burnside 35mm f/2.8 Lens
  • Twist 60mm f/2.5 Lens
  • Nanuk 910 Hard Case

Get the Lensbaby Pro Kit for Canon EF on sale at $799.95. Compare at $1,399.95. Find a description of the included lenses after the break.

More selected deals:

Click here to open the rest of the article

Today Only: Lensbaby Velvet 85mm f/1.8 – $369.95 (reg. $599.95, EF & RF mounts)

Lensbaby Velvet

Only for today (11/30/2022) B&H Photo has a $230 discount on the Lensbaby Velvet 85mm f/1.8 lens for both EF and RF mounts.

At a glance:

  • RF/EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/1.8 to f/16
  • Soft Glowing Effect at Wide Apertures
  • Inspired by Classic Portrait Lenses
  • 1:2 Magnification, 9.5″ Working Distance
  • Manual Focus Design
  • 12-Blade Diaphragm

Get the Lensbaby Velvet 85mm f/1.8 on sale at $369.95 (compare at $599.95):

There are still some BLACK FRIDAY deals that are live:

More selected deal pages:

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Canon Patent: RF 24-120mm f/2.8 IS & RF 85mm f/1.4 IS

Canon Patent

A new Canon patent application for a RF 24-120mm f/2.8 IS and RF 85mm f/1.4 IS lenses.

Canon patent application 2022175604 (Japan, published 11/25/2022) discusses optical formulas for two RF mount lenses, RF 24-120mm f/2.8 IS and RF 85mm f/1.4 IS. From the patent literature:

An object of the present invention is to reduce the size and weight of a movable group decentered with respect to an optical axis, while suppressing the occurrence of chromatic aberration due to the movable group.

Example 1

  • Focal Length: 24.72-116.36
  • F-value: 2.91
  • Half angle of view: 37.12-10.53
  • Image height: 21.64
  • Total length: 178.45-204.02
  • Back focus: 14.59

Example 2

  • Focal length: 82.47
  • F-value: 1.45
  • Half angle of view: 14.70
  • Image height: 21.64
  • Overall length: 126.52
  • Back focus: 13.50

Example 3

  • Focal length: 103.16-387.89
  • F-value: 4.64-7.30
  • Half angle of view: 11.84-3.19
  • Image height: 21.64
  • Total length: 176.10-288.59
  • Back focus: 15.98-63.01

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

[via asobinet.com]