Canon Patent: RF 70-200mm F2-2.8 DS, RF 70-135mm F2.5 DS, More Lenses

Canon Patent
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A new Canon patent application for RF mount lenses with “Defocus Smoothing” (DS) optical technology. More about Defocus Smoothing is listed here.

Canon patent application 2023170260 (Japan, published 12/1/2023) discusses optical formulas for a bunch of RF mount lenses:

  • 70-200mm F2-2.8
  • 70-135mm F2.5
  • 28-70mm F1.6-2
  • 80-150mm F1.8

All, apparently, have DS on board. From the patent literature:

  • An object of the present invention is to provide a variable power optical system that obtains a uniform and good apodization effect over the entire zoom range and suppresses peripheral dimming.
  • Background Art
    Conventionally, in order to obtain an appropriately blurred image, an optical system equipped with a filter having a transmittance distribution, such as an apodization filter whose transmittance changes as the distance from the optical axis increases, has been known. There is. Patent Document 1 discloses an optical system in which apodization filters are arranged before and after the aperture of a single focus lens.
  • However, since the optical system disclosed in Patent Document 1 is a single focus optical system, it is insufficient as a method for obtaining a sufficient apodization effect in each zoom state of a variable power optical system. Further, in a variable magnification optical system, it is required to suppress peripheral dimming and to obtain a good apodization effect during variable magnification.
  • Accordingly, an object of the present invention is to provide a variable power optical system that obtains a good apodization effect over the entire zoom range and suppresses peripheral dimming.

Example 1

  • Focal length: 71.79-193.181
  • F value: 2.00-2.85
  • Half angle of view: 16.77-6.39
  • Image height: 21.64
  • Total length: 161.48-219.93
  • Back focus: 15.67-31.62

Example 2

  • Focal length: 28.91-68.11
  • F value: 1.60-2.06
  • Half angle of view: 36.81-17.62
  • Image height: 21.64
  • Total length: 157.90-179.46
  • Back focus: 19.11-33.77

Example 3

  • Focal length: 35.02-68.11
  • F value: 1.80-2.06
  • Half angle of view: 31.71-17.62
  • Image height: 21.64
  • Total length: 162.01-179.46
  • Back focus: 22.26-33.77

Example 4

  • Focal length: 78.18-145.50
  • F value: 1.87
  • Half angle of view: 15.47-8.46
  • Image height: 21.64
  • Total length: 300.20-300.18
  • Back focus: 70.00

Example 5

  • Focal length: 72.00-135.00
  • F value: 2.50
  • Half angle of view: 16.72-9.10
  • Image height: 21.64
  • Total length: 250.00
  • Back focus: 40.00

More Canon patents are listed here.

[via asobinet]

Copycat Rumors Happen, Exactly Like S*** Does

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 Mark Ii Canon EOS Rf 24-50mm R6 Mark Ii 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 Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor
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Here we have a wonderful example of copycat rumor. Read on.

A new rumor by Camera Insider claims Canon will release four prime lenses for the RF mount in 2024, these:

  • RF14mm F1.4L USM
  • RF24mm F1.4 L IS USM
  • RF28mm F1.4 L IS USM
  • RF35mm F1.4 L IS USM

The funny thing, this rumor is almost exactly the photocopy of another rumor posted almost one year ago by Canon Rumors (which, btw, never became true).

It’s very easy to understand what’s going on here. The listed lenses have a high likelihood to be released, sooner or later, for the mere fact that they are present in each and every lens lineup. It’s certain that Canon will release them. So why not suggesting they will get announced in 2023, then 2024, and if still not here, let’s suggest 2025. Easy peasy, isn’t it?

They call it educated speculation. I do not ¯\_ (ツ)_/¯

Take this as example for how the rumor industry works, what it is based upon.

[via asobinet]

Canon Patent: TS-R 180mm F3.5 And TS-R 100mm F2.8 Lenses

Tilt-shift
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There must be a tilt-shift lens for the RF mount on Canon’s release radar, given all these pertinent patents we are seeing. I am pretty sure that soon the clickbaiters out there will break the news with rumors about…tilt-shift lenses for the RF mount.

Canon patent 2023162714 (Japan, published 11/9/2023) discusses optical formulas for two tilt-shift lenses for the RF mount:

  • TS-R 180mm F3.5
  • TS-R 100mm F2.8

From the patent literature:

  • [Problem] To obtain an optical system that can greatly tilt an in-focus object surface while reducing composition shift while the entire system is small.
  • BACKGROUND TECHNOLOGY: Photography that focuses on an object surface that is tilted with respect to a direction perpendicular to the optical axis is called tilt photography. In tilt photography, it is necessary to greatly tilt the surface of the object in focus in order to expand the range of image expression.
  • As an optical system for realizing this photographing, an imaging optical system equipped with a tilt mechanism is known.
  • On the other hand, in an imaging optical system having a tilt mechanism, the composition shifts (hereinafter also referred to as “composition shift”) when the system is tilted, which may impair convenience.
  • On the other hand, an imaging optical system is known that includes a plurality of lens sections that move in a direction perpendicular to the optical axis direction (Patent Document 1). In Patent Document 1, during tilt photography, the lens section A moves in a direction perpendicular to the optical axis direction, and the lens section B moves in a direction perpendicular to the optical axis direction so as to correct the shift effect generated in the lens section A. By moving the lens in the vertical direction, it is possible to take tilted shots with small composition shifts.
  • An imaging optical system that includes a plurality of lens units that move in a direction perpendicular to the optical axis direction as in Patent Document 1 moves the lens unit in a direction perpendicular to the optical axis direction during tilt photography. Aberrations occur due to optical eccentricity. The amount of aberration caused by this eccentricity increases as the amount of inclination of the object surface for tilt photography increases. In Patent Document 1, since the lens group A that moves in the direction perpendicular to the optical axis direction has negative refractive power, the height from the optical axis of off-axis light incident on the lens section B increases, and the lens The amount of eccentric aberration that occurs when portion B is decentered increases. Furthermore, since the height of the off-axis light from the optical axis increases, the diameter of the lens portion B increases. Therefore, it becomes difficult to increase the eccentricity of the lens portion B, and as a result, it is difficult to greatly tilt the object surface that is in focus.
  • Accordingly, an object of the present invention is to provide an optical system that can greatly tilt the object surface in focus while reducing composition shift while the entire system is small, and an imaging apparatus having the same.

Example 1

  • Focal length: 179.88
  • F value: 3.60
  • Half angle of view: 6.86
  • Image height: 21.64
  • Total length: 198.10
  • Back focus: 27.03

Example 2

  • Focal length: 193.86
  • F value: 2.88
  • Half angle of view: 6.37
  • Image height: 21.64
  • Total length: 182.73
  • Back focus: 26.48

Example 3

  • Focal length: 97.23
  • F value: 2.88
  • Half angle of view: 12.54
  • Image height: 21.64
  • Total length: 176.52
  • Back focus: 14.71

Example 4

  • Focal length: 89.85
  • F value: 3.50
  • Half angle of view: 13.54
  • Image height: 21.64
  • Total length: 184.06
  • Back focus: 28.19

Example 5

  • Focal length: 134.80
  • F value: 3.50
  • Half angle of view: 9.12
  • Image height: 21.64
  • Total length: 135.33
  • Back focus: 37.11

More Canon patents are listed here.

[via asobinet]

Are These The Canon RF 200-800mm F6.3-9 IS Specifications?

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 Mark Ii Canon EOS Rf 24-50mm R6 Mark Ii 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 Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor
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It is rumored to get announced on November 2, 2023, and here are some possible specifications.

Here are the alleged Canon RF 200-800mm F6.3-9 IS specifications:

  • November 2, 2023
  • Compatible with RF teleconverters
  • Focus drive method is unknown
  • Not L series
  • It is unlikely that it will be dustproof and splashproof.
  • White
  • Equipped with DO lens
  • Possibly 300-800mm
  • Extending zoom structure

Stay tuned for more.

[via asobinet]

Canon Set To Announce Three Lenses On November 2nd, 2023?

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 Mark Ii Canon EOS Rf 24-50mm R6 Mark Ii 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 Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor
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I like the timing with which some rumors are spread to the world. First we had the suggestion that Canon might release a new inexpensive telephoto lens next week. Now there is more. Read on.

A new rumor has it, that Canon might announce three new RF lenses on November, 2, 2024. Says the source of the rumor about the three lenses:

  • Canon RF 200-800mm f/6.3-9 IS (Still no word on whether it’s USM or STM)
  • Canon RF-S 10-18mm f/4.5-6.3 IS STM
  • The third lens is one of three that we have been told are coming “soon”, but we haven’t confirmed which one will come on November 2.

So maybe three lenses , maybe not. If the rumor is true, expect to see leaked images very soon.

Spend your time with actual photography, and less with rumors ;-)

Source: Canon Rumors

Canon RF 200-800mm f/6.3-9 IS Announcement On 11/2/2023?

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 Mark Ii Canon EOS Rf 24-50mm R6 Mark Ii 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 Canon Eos R1 Eos R5c Canon Rf 16mm Rf 35mm F/1.2L EF Lenses Tilt-shift Lenses Rumor
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It seems Canon is set to announce a new inexpensive telephoto lens, the Canon RF 200-800mm f/6.3-9 IS.

This is going to be a non-L lens, i.e. a consumer lens. Despite that, it is rumored that the lens will come with white painting, usually reserved for Canon’s top tier telephoto lenses. And there is more: the lens is rumored to feature DO elements (diffractive optics). Given that we are talking about a non-L lens, that seems to be a bit of a stretch. Pricing of the RF 200-800mm f/6.3-9 IS is rumored to be above $2000, although not by much.

There have been a few patent applications that might refer to this lens.

Stay tuned.

[via asobinet.com]