Canon Patent: 16mm f/2.8 & 20mm f/2.8 With Image Stabilization

Canon Patent

A new Canon patent to start a new week. Once more for lenses for the RF mount.

Canon patent 2022125455 (Japan, published 8/29/2022) discusses optical formulas for two prime lenses, a 16mm f/2.8 and a 20mm f/2.8, both with image stabilisation. From the patent literature (machine translated):

[Title of Invention] Optical system, lens device having the same, and imaging device

The present invention provides an optical system having a wide angle of view, a small size and light weight, and high optical performance in the non-stabilizing state while suppressing peripheral image quality deterioration during image blur correction, and a lens device and an imaging device having the same.

Description of the Related Art

Conventionally, as means for correcting image blurring, there are known a lens-shift type anti-vibration mechanism that shifts a part of an optical system and a sensor-shift type anti-vibration mechanism that shifts an imaging device. In a central projection optical system, the amount of movement of the image point in response to changes in the angle of incidence of light rays entering the optical system is not uniform on the imaging surface. However, image blur remains around the imaging surface.

The imaging apparatus of Patent Document 1 can correct image blur at a specific image point position, but cannot uniformly correct image blur at all angles of view.

In an equidistant projection optical system, the image quality around the imaging surface is less likely to deteriorate during image blur correction. Therefore, in order to suppress image quality deterioration around the imaging surface, it is necessary to generate a large amount of distortion in the negative direction in the central projection method, and reduce the absolute value of the amount of distortion in the equidistant projection method.

An optical system with a large absolute value of the amount of distortion aberration in the central projection method produces a greatly distorted image, so it is often used in combination with an imaging apparatus equipped with electronic distortion correction. In this case, if the distortion aberration in the central projection method is excessively generated, the image quality around the imaging surface is degraded due to the extension of the electronic distortion correction.

Example 1

  • Focal length: 24.22
  • F-value: 1.85
  • Image height: 19.38
  • Overall length: 85.24
  • Back focus: 12.06

Example 2

  • Focal length: 19.48
  • F value: 2.88:
  • Image height: 18.60
  • Overall length: 73.01
  • Back focus: 12.19

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

[via asobinet]

Do You Think Canon Made A Huge Mistake?

Viltrox Eos R7 Eos R10 Canon Cameras Europe Canon Eos R1 Eos R Rf 14-35mm Olympic Games Ef-mount Rudy Winston

Did Canon make a huge mistake when they told Viltrox not to market auto-focus lenses for the RF mount?

The reason for Canon’s reaction are patent infringements, i.e. violation of Canon’s intellectual property. So, was this a dumb move, besides being an overzealous move? Me thinks third party RF mount lenses would benefit the EOS R system as a whole. But who am I to judge?

Christopher Frost posted a video-essay where he analyses and discusses Canon’s decision. The video lasts 7 minutes and is definitely worth your time.

Share your thoughts in the comment section.

Canon RF 16mm f/2.8 STM Review (fun, flawed, and useful, D. Abbott)

Rf 16mm F/2.8 STM Review

Here is a Canon RF 16mm f/2.8 STM review by one of our favorite gear reviewers. This lens is inexpensive yet it delivers.

At a glance:

  • RF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to f/22
  • One Aspherical Element
  • Super Spectra Coating
  • STM Stepping AF Motor
  • Customizable Control Ring
  • Rounded 7-Blade Diaphragm

Dustin Abbott posted his exhaustive Canon RF 16mm f/2.8 STM review. Many so called “reviews” out there are nothing more than rewritten user manuals. Not Mr. Abbott; his reviews are professional, thoroughly, and answer all questions you might have. From Mr. Abbott’s conclusion:

[…] the Canon RF 16mm F2.8 STM is fun, flawed, and useful. It does have some severe flaws, but I love the flexibility of the focal length and the compact size of the lens. It does something that no other lens is really doing on the Canon RF platform right now, and does it at a truly reasonable price point.

The RF 16mm is not going to compete with L series lenses optically, but I also found that images had a certain pop to them that stood out when I compared them to images I was taking on the Canon EOS R7 and EF-S 18-150mm STM that I was reviewing at the same time.  This image, for example, is pretty lovely.

So, in conclusion, the Canon RF 16mm F2.8 STM is not only worth buying because it is cheap, but also worth buying because it is competent.  It will go anywhere with you and provides a nicely wide alternative to something like the 24-105mm or 24-70mm lenses.  It would also be a great focal length counterpart if your primary lens on an outing is a telephoto, offering the option to get a wider angle of view but with a minimum of additional size and weight.  It is for this reason that I’m considering a purchase even despite the RF 16mm’s many flaws.

Read the full review at dustinabbott.net

The review comes with test charts, sample pics, and much more. As usual, D. Abbott also posts a video-review that someone might prefer to the written review. It’s here for your viewing pleasure.

Canon RF 16mm f/2.8 STM (sells at $299):

America: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA
Europe & UK: Amazon DE, Amazon UK, Amazon IT, Wex Photo Video, Canon DE, Canon UK

Click here to open the rest of the article

Canon To Announce 4 Wide-angle L-grade Primes For The RF Mount Within Next 12 Months?

Rf Mount Eos R6 Mark Ii Rf 300mm Rf 35mm Canon Eos R100 Rf 24mm F/1.8 Rf-s Canon Eos R7 Eos R100 Canon High Resolution Eos R R10 Eos C5 Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor

A new Canon rumor surfaced. Canon might be set to announced four L-grade prime lenses for the RF mount within the next 12 months.

These are the rumored lenses:

  • Canon RF 12mm f/1.8L USM
  • Canon RF 24mm f/1.4L USM
  • Canon RF 28mm f/1.4L USM
  • Canon RF 35mm f/1.2L USM

Moreover, the Canon RF 135mm f/1.8L USM might also get announced soon, maybe it is the first one to get announced.

Stay tuned.

Source: Canon Rumors

Here Are Some Speculations About Why Canon Doesn’t Want Others To Make RF Lenses

Viltrox Eos R7 Eos R10 Canon Cameras Europe Canon Eos R1 Eos R Rf 14-35mm Olympic Games Ef-mount Rudy Winston

After the story about Viltrox having told by Canon not to make RF mount lenses broke, some speculations about the reasons surfaced.

What might be the reasons? Canon Germany released a statement to Photographix Magazine (emphasis mine):

“SHENZHEN JUEYING TECHNOLOGY CO.LTD, manufactures auto focus lenses for Canon RF mount under the brand name “Viltrox”. Canon believes that these products infringe their patent and design rights and has therefore requested the company to stop all activities infringing on Canon’s intellectual property rights.”

So, all about copyright and patents, duh? That doesn’t seem to satisfy those who inquire more, and are keen to speculations. It is suggested, Canon does not have any “plans to give permission to third party manufacturers to utilize their RF mount patents as they pertain to electronics and autofocus anytime in the near future.” The reasons for that are listed as follows:

* Canon doesn’t feel the RF lineup is anywhere near maturity, and they want the lineup filled out with their own lenses first. Canon still has lots of work to do in both the non-L and L lineups.

* Canon believes the “more affordable” options are already covered by the hundred and whatever million EF lenses out there that work extremely well on the RF mount with Canon’s line of adapters.

* Canon isn’t done with tweaks and improvements to the RF mount.

This might well be the case. Never the less, it seems a bit of a far stretch to us and we wonder how much of this is just educated guess. What do you think?

Source: Canon Rumors

It Seems Canon Doesn’t Want Viltrox To Make RF Mount Lenses

Viltrox

Does Canon not want Viltrox to manufacture lenses for the RF mount? Seems so.

It started with a user in the DPReview forum who posted a chat with Viltrox. Apparently, as you can read below, Viltrox has been “told by Canon to stop selling all RF mount products“.

Now, there is a follow up to this. So far Canon did not release any official statement. But now Canon Germany answered to German Photographix Magazine, and Canon said (machine translated):

“SHENZHEN JUEYING TECHNOLOGY CO.LTD, manufactures auto focus lenses for Canon RF mount under the brand name “Viltrox”. Canon believes that these products infringe their patent and design rights and has therefore requested the company to stop all activities infringing on Canon’s intellectual property rights.”

So, it’s about patents and intellectual property. Anyways, not cool at all dear Canon. Change your mind asap, please.