Canon Patent: 35mm f/1.3 Lens With Very Short Back Focus

canon patent

A new Canon patent was spotted. Will this lens ever hit the shelves? Unlikely in our opinion.

Canon patent application 2023077336 (Japan, published 6/5/23) discusses optical formulas for a 35mm f/1.3 lens.

An object of the present invention is to realize an optical system capable of reducing ghosts in a desired wavelength region in spite of having a large aperture and a small lens.

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an optical system and the like, and is suitable for imaging apparatuses such as digital video cameras, digital still cameras, broadcast cameras, surveillance cameras, cameras for wearable devices, and cameras for mobile devices.

2. Description of the Related Art
There is a demand for a high-performance optical system that reduces the occurrence of ghosts and flares. In order to reduce the occurrence of ghosts and flares, a method of providing an antireflection film on the lens surface is known.
In recent years, optical systems have become larger in diameter and smaller in size, and the opening angle of lenses tends to increase. However, due to problems in manufacturing the antireflection film, the antireflection effect in the periphery of the lens with a large opening angle may be inferior to the antireflection effect in the position on the optical axis.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an optical system capable of reducing ghosts, particularly in a desired wavelength region, while having a large aperture and a small lens.

Example 1

  • Focal length: 12.40
  • F-value: 1.30
  • Half angle of view: 32.82
  • Image height: 8.00
  • Overall length: 21.76
  • Back focus: 0.44

Example 2

  • Focal Length: 33.53
  • F-value: 1.30
  • Half angle of view: 32.83
  • Image height: 21.64
  • Overall length: 61.97
  • Back focus: 0.29

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

Three New Wide Angle L-tier RF-mount Prime Lenses Coming First Half 2023?

canon rumors canon news eos r7 mark ii

A new Canon rumor concerning RF-mount lenses. Three of them, all primes.

Latest murmuring has it that Canon might release three wide angle “L” lenses for the RF-mount. Says the source of the rumor (emphasis mine):

[…] Canon actually plans to launch 3 wide angle L prime lenses from the RF mount in the first half of 2023. One of the lenses will be the RF 35mm f/1.2L (or f/1.4) and an RF 24mm f/1.4L USM. The third lens is unknown at this time, though [it might be] an L 28mm prime lens

The RF 35mm f/1.2L is rumored since a long time. No surprise since it is a lens Canon will release for sure, sooner or later. All three lenses will for sure be announced sooner or later. Maybe it will happen in the first half of 2023.

Stay tuned.

Source: Canon Rumors

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:

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YONGNUO Might Release Lenses For Canon Cameras, Rumor Has It

YONGNUO

Interesting Canon rumor coming from Asia. YONGNUO might be set to soon release a lens for the Canon RF mount.

An image shared by CameraBeta shows EXIF information suggesting a YN35mm F1.4 UWM was used on a Canon EOS R6 body (see image above). Interesting.

While this would be one of the very few third party lens for the RF mount. However, if it is an autofocus lens (it seems) then the question is how Yongnuo has solved the patent infringement issues Canon already raised with Viltrox.

Let me know what your thoughts are.

[via asobinet]

Today Only: Mitakon Speedmaster 35mm f/0.95 Mark II (EF-M) – $369 (reg. $599)

Speedmaster 35mm f/0.95

Only for today (10/28/2022) B&H Photo has a $230 discount Mitakon Zhongyi Speedmaster 35mm f/0.95 Mark II for Canon EF-M mounts.

At a glance:

  • Canon EF-M Mount/APS-C Format
  • 56mm (35mm Equivalent)
  • Aperture Range: f/0.95 to f/16
  • One Extra-Low Dispersion Element
  • Two Extra-High Refractive Index Elements
  • Three High Refractive Index Elements
  • Manual Focus Design
  • De-Clicked Aperture Ring
  • Depth of Field and Distance Scales
  • Nine-Blade Diaphragm

Get the Mitakon Zhongyi Speedmaster 35mm f/0.95 Mark II on sale at $369. Compare at $599. Black and silver versions available.

More selected deals:

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Canon Patent: 35mm And 45mm f/2.8 For Full Frame, And 35mm f/2.8 For APS-C

Canon patent

A new Canon patent for more RF mount lenses: 35mm and 45mm f/2.8 for full frame imaging sensors, and a 35mm f/2.8 for APS-C sensors.

Canon patent application P2022163979 (Japan, published 10/27/2022) discusses optical formulas for the following lenses for the RF mount:

  • 35mm f/2.8 (for full frame)
  • 45mm f/2.8 (for full frame)
  • 35mm f/2.8 (for APS-C)

From the patent literature:

A compact and lightweight optical system having high optical performance is provided by appropriately setting the refractive index and power arrangement of each lens.

Description of the Related Art

In recent years, imaging devices have been miniaturized, and the number of pixels of imaging elements used in the imaging devices has increased.

Description of the Related Art

As image pickup devices become smaller and have more pixels, optical systems used in image pickup apparatuses are required to have high optical performance, and to be compact and lightweight.

Example 1

  • Focal Length: 33.13
  • F-value: 2.91
  • Half angle of view: 33.15
  • Image height: 21.64
  • Overall length: 41.51
  • Back focus: 11.50

Example 2

  • Focal length: 34.76
  • F-value: 2.80
  • Half angle of view: 21.45
  • Image height: 13.66
  • Overall length: 40.98
  • Back focus: 13.10

Example 3 

  • Focal length: 46.55
  • F-value: 2.80
  • Half angle of view: 24.93
  • Image height: 21.64
  • Overall length: 53.50
  • Back focus: 14.80

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

[via asobinet]