Canon Patent: RF 100-300mm f/2.8L IS USM Lens

Canon Patent

A new Canon patent application was spotted.

Canon patent application 2023099388 (Japan, published 7/13/2023) discusses optical formulas for what appears to be an RF 100-300mm f/2.8L IS USM lens for the EOS R camera system. From the patent literature:

Title of Invention

A zoom lens, an imaging device having the same, and an imaging system.

An object of the present invention is to provide a lightweight zoom lens that has high optical performance over the entire zoom range, and an imaging device and an imaging system having the zoom lens.

Description of the Related Art

In recent years, zoom lenses used in imaging apparatuses are required to have high optical performance over the entire zoom range and to be lightweight. In order to meet these requirements, the zoom lens has a first lens group with positive refractive power, a second lens group with negative refractive power, and a subsequent group including a plurality of lens groups, arranged in order from the object side to the image side. Lenses have been proposed (see Patent Documents 1 and 2).

A large-aperture telephoto zoom lens having a long focal length and a small F-number tends to have a large lens diameter, which tends to cause an increase in weight. In order to reduce the weight of the zoom lens, it is effective to increase the positive refractive power of the first lens group and reduce the lens diameters of the lens groups included in the subsequent group. However, if the refractive power of the first lens group is made too strong, it becomes difficult to correct spherical aberration, axial chromatic aberration, and lateral chromatic aberration, especially at the telephoto end.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a lightweight zoom lens that has high optical performance over the entire zoom range, and an imaging apparatus and imaging system having the zoom lens. Focusing is performed by moving the fifth lens unit L5 and the sixth lens unit L6 along different trajectories . Specifically, the fifth lens unit L5 and the sixth lens unit L6 move toward the image side when focusing from an infinite object to a close object.

Example 1

  • Focal length: 103.00-292.00
  • F-value: 2.90
  • Half angle of view: 11.86-4.24
  • Image height: 21.64
  • Total length: 333.61
  • Back focus: 31.93

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

[via asobinet]

Canon Might Have An RF-mount Fisheye Zoom In The Pipeline

Rf 5.2mm F/2.8L

Nothing surprising here. Why should Canon not work on a fisheye zoom lens for the EOS R system.

Rumor has it that…:

[…] a zoom fisheye similar to the EF version will be coming for the RF mount. It will be an “all-new” optical design and will work just fine on both crop and full-frame cameras.

For the time being, Canon only released the RF 5.2mm f/2.8L USM Dual Lens Fisheye for the EOS R system. The RF 5.2mm aims at virtual reality applications.

As usual, take it with salt. Unless the usual few Japanese sites confirm it, it’s just educated speculation.

Stay tuned, or even better: don’t, and get out taking pics.

Source: Canon Rumors

Canon Might Announce The RF 200-500mm f/4L IS Soon

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 CP+ 2024 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

A new super expensive RF 200-500mm f/4L IS lens for the EOS R system? It looks like according to the latest rumor emerging from the interweb of rumor mills.

Says the source of the rumor:

Canon’s EF 500mm f/4L IS USM II is going to be a zoom for the RF mount first. We have confirmed that a Canon RF 200-500mm f/4L IS USM will likely be coming in Q4, or perhaps in Q1 of 2024 ahead of the Canon EOS R1.

The Canon RF 200-500mm f/4L IS USM will not come with a built-in teleconverter.

Another RF lens that will cost like a small car.

Source: Canon Rumors

Canon Might Soon Release An Ultra-wide Lens For The RF-mount, Rumor Suggests

Nab 2023 Canon Eos R5 Mark Ii Canon Eos R8 CP+ 2024 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

Is Canon set to announce an ultra-wide lens for the RF-S mount? It appears so.

The source of the rumor has been…:

[…] told that “one of” the next lenses announced from Canon will be an ultra-wide for the RF-S mount. We are are going to assume that the lens will be some kind of variation of the terrific Canon EF-M 11-22mm f/4-5.6 IS STM.

We think it is very likely Canon has such a lens on their release plan.

Source: Canon Rumors

Is Canon Testing Prototypes Of Upcoming Tilt-shift Lenses?

TS-E 17mm F/4L

It seems Canon might be set to soon announce new tilt-shift lenses for the RF mount.

Rumor has it that Canon is already testing two tilt-shift lenses in the wild. The source claims they have been “told that the new tilt-shift lenses are in the hands of a select group of photographers“. These are the two rumored tilt-shift lenses:

  • Canon TS-R 14mm f/4L
  • Canon TS-R 24mm f/3.5L

What do you think?

Source: Canon Rumors