Canon patent: 55mm F1.24 Lens With Double Gauss Element Arrangement

Canon Patent

Another Canon patent, although we doubt that this one will ever hit the market.

Canon patent application 2023127280 (Japan, published 9/13/2023) discusses optical formulas for a 55mm F1.24 lens with a double Gauss element arrangement.

From the patent literature:

An object of the present invention is to provide an optical system that has a bright F number, is compact, has high optical performance, and also suppresses fluctuations in various aberrations associated with focusing.

Background Art

In recent years, photographing optical systems with a standard angle of view, where the half angle of view is about 20 degrees to 30 degrees, used in imaging devices have a bright F number and have high optical performance despite the small size of the entire system. That is required. A so-called double Gauss type optical system is known as a standard angle of view photographing optical system. In a Gauss type optical system, the lenses are arranged symmetrically around the aperture, and with a small number of lenses, it is possible to obtain high optical performance despite being compact.

However, in the optical system described in Patent Document 1, the back focus tends to become long and the total length of the lens becomes long, so it is difficult to suppress the increase in size of the imaging device.

In order to achieve a compact lens with a high F-number, high optical performance, and suppression of fluctuations in various aberrations associated with focusing, it is important to appropriately set the structure and material of the lens.

An object of the present invention is to provide an optical system that has a bright F number, is compact, has high optical performance, and also suppresses fluctuations in various aberrations associated with focusing.

Example 1

  • Focal length: 53.80
  • F value: 1.24
  • Half angle of view: 21.91
  • Image height: 21.64
  • Total length: 78.46
  • Back focus: 29.83

Example 2

  • Focal length: 55.98
  • F value: 1.24
  • Half angle of view: 21.13
  • Image height: 21.64
  • Total length: 84.99
  • Back focus: 30.07

Example 3

  • Focal length: 56.00
  • F value: 1.24
  • Half angle of view: 21.12
  • Image height: 21.64
  • Total length: 79.92
  • Back focus: 30.00

More Canon patents are listed here.

[via asobinet]

Announced: Petzval 55mm f/1.7 MKII Lens for Canon EOS R (and other FF MILCs)

Petzval 55mm

Lomography announced the Petzval 55mm f/1.7 MKII lens for Canon EOS R, Nikon Z and Sony E full frame mirrorless systems. The Petzval 55mm f/1.7 MKII will go on sale starting at $399.

Press release:

New Petzval 55 mm f/1.7 MKII Brass

Sporting a solid, satin-finished exterior, the Petzval 55 mm f/1.7 is sure to turn heads and keep them turned for years to come. Available with Sony E, Canon RF and Nikon Z mounts!

The First Petzval Designed for Mirrorless
We are introducing the first Petzval Art Lens built specifically for full-frame mirrorless cameras. Coming standard with mounts for Canon RF, Nikon Z and Sony E – the New Petzval 55 mm f/1.7 has been streamlined with a robust, modern build quality and requires no pesky adaptors.

Petzval 55mm

Dual Aperture System
The brass edition features an 8-blade diaphragm aperture system regulated by a control knob, providing it with both authenticity and a vintage feel. On top it hosts a classic waterhouse aperture system allowing to tweak the bokeh with exceptional shapes.

Engineered Harmony
Featuring a new bokeh control ring, improved optic design and dual aperture system – you can manually manipulate your shots to achieve any desired style. The New Petzval 55 mm f/1.7 offers reliability and top-tier professional quality without sacrificing its vintage styling.

A Tribute to Joseph Petzval’s Legacy
Preserving the vintage quality and feel while boasting the uniformity and compatibility of present-day technology, we’ve combined the legendary 180 year old aesthetic with the dependability of today’s lenses.

Improved Bokeh Control – Deliciously Dreamy to Strikingly Sharp
Rather than changing the aperture to modify the bokeh effect, the New Petzval 55 mm f/1.7 includes a dedicated bokeh control ring – an improvement that gives this lens more flexibility than any other traditional lens.

Rest-assured with the New Petzval 55 mm f/1.7 brass edition, you will be in possession of an art lens of the highest quality. Known for their robustness and durability, brass lenses are sought-after for the classic aesthetic they embody. The Petzval 55 mm f/1.7 brass edition is no exception – sporting a solid, satin-finished exterior, it’s sure to turn heads and keep them turned for years to come.

Along with classic brass, the Petzval 55 mm f/1.7 comes in a brass coated with a sleek, painted-black finish, as well as the modern looking, black-anodized aluminum edition. All finishes are compatible with Canon RF, Nikon Z and Sony E mounts, be sure to choose the option that fits your equipment.

Canon patent for EF-M 55mm f/3.5 macro lens

canon patent

A Canon patent for an EF-M 55mm f/3.5 macro lens for the EOS M system.

Canon is working on the future of the EOS M system, and there is a lot to come in 2016. This patent is just a hint about Canon’s mirrorless plans. This is a patent for an APS-C sensor, so the rumored Canon full-frame mirrorless camera is not involved here. However, we spotted a Canon patent for a similar optical formula some time ago (50mm f/3.5 IS). According to my sources, Canon’s full-frame mirrorless camera has been delayed because of mount-related issues. Another rumor we got, states that early prototypes of such a camera are already undergoing lab tests. Hard to say when we really can expect this camera, but I am sure it is coming.

Canon is now taking their EOS M system seriously. The EOS M3 was the right step in the right direction, and is a great camera. Some clickbait sites are saying that the EOS M3 is one of Canon’s worse releases of 2015. That’s utterly dumb and likely the oddest statement about Canon in 2015, and has the sole purpose to get traffic by smashing Canon. I have to say that I am surprised to see how many people feels the urge to smash the Canon EOS M3, as they did before with the EOS M. Guess this is just childish, and profitable. I own both cameras, along  with APS-C and FF bodies. Well, I am now on travel for the next 2 months and guess what camera I have with me? Right, the EOS M3. A great mirrorless camera with an image quality that outperforms most of the competitors.

  • Patent Publication No. 2015-215391
    • Published 2015.12.3
    • Filing date 2014.5.8
  • Example 1
    • Focal length 53.73
    • F-number 3.50
    • Half angle (in degrees) 14.26
    • Image height 13.66
    • Overall length of the lens 76.39
    • BF 17.69

[via Egami]


Dustin Abbott, Zeiss Otus 1.4/55mm APO Distagon T* Review

I directly compared the Otus to the flagship 50mm lens from Canon, the EF 50mm f/1.2L. I praised that lens in many ways, and I do think it has more to offer than some have given it credit for. […] But at the same know that in every measurable head to head comparison (other than autofocus!) it was no contest. The Otus simply destroys it. The Sigma 50mm f/1.4 ART series lens is somewhat better competition in terms of sharpness, and (to a lesser extent) contrast, but in overall image quality it falls short of Otus. The Sigma ART is a very nice lens, but, ironically, it isn’t nearly as “artful” as the Otus 55. The Otus has not only the biting sharpness and overall contrast but also adds a truly beautiful out of focus rendering that just seems to produce more “creaminess” than any of the lenses I stacked it up against.

DxOMark Confirms Sigma 50mm f/1.4 Art Performs Very Close To Zeiss 55mm f/1.4

With all this hype about Sigma’s new 50mm f/1.4 DG HSM “Art” lens, it’s fine to see that also DxOMark confirms the exceptional optical properties of this lens, and that it can hold up to the Zeiss Otus 55mm f/1.4 – a lens you have to pay $4,000. And now compare that to the $949 that you have to pay for the Sigma 50mm f/1.4 Art lens. And then: the Zeiss is manual-focusing, the Sigma has auto-focus. Pre-orders for the Sigma 50mm f/1.4 “Art” lens can be made at B&H Photo and Adorama, stocks are limited for the time being.

The Sigma scored 35 vs the 38 of the Zeiss. Says DxOMark about the comparison between the two lenses:

[…] the extreme performance of the Zeiss is noticeable in some subtle ways. At wider apertures, the Art lens can’t quite match the sharpness of the Zeiss in the outer field but that won’t be a concern for all but the most fastidious of users.

At f2 the Sigma is almost on a par with the Zeiss, only it can’t quite match the Zeiss in the corners – though the difference in real world terms is trivial. The new Sigma can boast of slightly better control of vignetting and, arguably, chromatic aberration at maximum aperture, though there’s some fringing evident in the extreme corners.

Not bad for a lens that costs a fourth of the Zeiss :-)

[via DxOMark]

Sigma 50mm f/1.4 Art

Sigma 50mm f/1.4 Holds Up To The Zeiss Otus 55mm f/1.4

The Zeiss Otus 55mm f/1.4

A few days after having published their review about the Sigma 50mm f/1.4 DG HSM lens, the folks at SLRGear published their review of the Zeiss Otus 55mm f/1.4 lens, a manual focusing, optical gem that sells for $4,000.

The Zeiss Otus 55mm f/1.4 is the lens Sigma claims they want to compete with their 50mm f/1.4 lens. There is still no official announcement about the Sigma’s price, but Photo Rumors says they got a rumor stating that the Sigma 50mm f/1.4’s price will be $1,030. Well, that´s a fourth of the Zeiss!

About sharpness of the Zeiss Otus 55mm f/1.4:

Given the price tag and their history of high quality lenses, we were expecting the Zeiss 55mm ƒ/1.4 Otus to display truly impressive results, and we weren’t disappointed

and compared to the Sigma 50mm f/1.4:

The Sigma 50mm ƒ/1.4 Art is just as sharp right in the center, but the Zeiss shows significantly better sharpness over the rest of the frame, particularly in the corners.

Conclusion and how the Zeiss holds up to the Sigma:

Despite the dramatic difference in price, the Sigma competes handily with the $4,000 Zeiss 55mm Otus lens. […] With extremely sharp images, even wide open, the Sigma also has fantastic vignetting and CA control, and a phenomenally low level of distortion. While the Zeiss does show better performance in the corners at ƒ/1.4 on a full-frame camera, the other optical performance characteristics are pretty evenly matched.

What do you think about the fact that “optical performance characteristics are pretty evenly matched”? So, substantially the  Sigma 50mm f/1.4 matches the Zeiss Otus 55mm f/1.4 in as good as all tests SLRGear made. The Zeiss is sharper in the corners at f/1.4, and that’s all the Zeiss has to beat the Sigma. And the Sigma has auto-focus and could possibly cost a fourth of the Zeiss.

The Sigma 50mm f/1.4 DG HSM lens is an exciting pieces of glass. Can’t wait to see more reviews of this lens.



[via SLRGear]

Zeiss Otus 55mm f/1.4 price check: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA

Zeiss Otus 55mm f/1.4 specifications and description after the break.

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