Canon Patent: 11mm F2, 13mm F2, 22mm F2, And 30mm F2 Lenses For RF-S Mount

Canon Patent
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Here is a new Canon patent application, for a bunch of fast primes for the RF-S mount.

Canon patent application P2023130885 (Japan, published 9/21/2023) discusses optical formulas for RF-S mount prime lenses:

  • 11mm F2
  • 13mm F2
  • 22mm F2
  • 30mm F2

From the patent literature:

An object of the present invention is to provide a rear focus optical system that is compact and capable of good aberration correction.

BACKGROUND ART

In imaging, it is required to suppress the generation of noise during zooming and focusing. In order to suppress noise during focusing, the rear focus (inner focus) method, in which focusing is performed by moving the lens group closest to the image side than the lens group closest to the object side, is recommended because it provides the best sound isolation effect from the object side lens. suitable.

Rear focus type optical systems are also required to be compact and have good aberration correction. In order to realize such an optical system, it is necessary to appropriately set the lens arrangement and the focal length of each lens.

The present invention provides a rear focus type optical system that is compact and capable of good aberration correction, and an imaging device equipped with the same.

Example 1

  • Focal length: 13.40
  • F value: 2.06
  • Half angle of view: 43.01
  • Image height: 12.50
  • Total length: 77.83
  • Back focus: 12.43

Example 2

  • Focal length: 11.30
  • F value: 2.06
  • Half angle of view: 47.89
  • Image height: 12.50
  • Total length: 77.85
  • Back focus: 12.44

Example 3

  • Focal length: 22.00
  • F value: 2.06
  • Half angle of view: 29.60
  • Image height: 12.50
  • Total length: 72.85
  • Back focus: 12.444

Example 4

  • Focal length: 30.52
  • F value: 2.06
  • Half angle of view: 22.27
  • Image height: 12.50
  • Total length: 75.88
  • Back focus: 14.49

More Canon patents are listed here.

[via asobinet]

Canon RF-S 22mm f/2 STM Coming Alongside The Canon EOS R50?

Canon EF-M 32mm F/1.4 STM EF-M 22mm Canon Lenses
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Being owned by a commercial entity appears to do well to a well known source of Canon rumors. Here is another one in a row of recent rumors.

Rumor has it that the Canon might announced a new lens along with the rumored Canon EOS R50, the Canon RF-S 22mm f/2 STM.

The optical design of the Canon RF-S 22mm f/2 STM is said to be almost the same as the Canon EF-M 22mm f/2 STM. Indeed, this might be a port from the EF-M mount to the RF mount. No specifications leaked so far but if the optical design is similar to the EF-M 22mm, then these might (more or less) apply:

  • Moderate Wide-Angle Lens
  • Bright f/2 Lens Aperture
  • Exceptional Low-Light Performance
  • One Aspheric Lens Element
  • Built-In Stepping Motor
  • Smooth & Continuous AF
  • Seven Blade Circular Aperture
  • Short Minimum Focusing Distance of 5.9″

Stay tuned for more.

Source: Canon Rumors

Canon Patent: 22mm, 24mm, 33mm, 35mm, all f/1.4, For The RF Mount

Canon Patent
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And here is a new Canon patent application for lenses for the RF mount: 22mm, 24mm, 33mm, 35mm, and all are f/1.4.

Canon patent application 2021-113905A (spotted by High Lows Note) discusses optical formulas for the following RF-mount lenses:

  • RF 22mm f/1.4
  • RF 24mm f/1.4
  • RF 33mm f/1.4
  • RF 35mm f/1.4

Here they are:

Embodiment 1

  • FOCAL LENGTH (MM): 35.00
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 31.73
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 126.05
  • BACK FOCUS (MM): 11.06

Embodiment 2:

  • FOCAL LENGTH (MM): 35.00
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 31.72
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 128.31
  • BACK FOCUS (MM): 11.06

Embodiment 3

  • FOCAL LENGTH (MM): 34.99
  • F NUMBER: 1.43
  • HALF ANGLE OF VIEW (DEGREE): 31.73
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 123.63
  • BACK FOCUS (MM): 11.06

Embodiment 4:

  • FOCAL LENGTH (MM): 24.17
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 41.83
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 124.64
  • BACK FOCUS (MM): 11.06

Embodiment 5:

  • FOCAL LENGTH (MM): 33.11
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 33.17
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 126.01
  • BACK FOCUS (MM): 11.06

Embodiment 6:

  • FOCAL LENGTH (MM): 33.03
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 33.23
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 125.39
  • BACK FOCUS (MM): 11.06

Embodiment 7:

  • FOCAL LENGTH (MM): 34.99
  • F NUMBER: 1.43
  • HALF ANGLE OF VIEW (DEGREE): 31.73
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 122.18
  • BACK FOCUS (MM): 11.06

Embodiment 8:

  • FOCAL LENGTH (MM): 22.00
  • F NUMBER: 1.42
  • HALF ANGLE OF VIEW (DEGREE): 44.52
  • IMAGE HEIGHT (MM): 21.64
  • LENS LENGTH (MM): 125.60
  • BACK FOCUS (MM): 11.06

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

Canon EF-M 22mm f/2 STM review, it’s a no-brainer (photozone)

Canon EF-M 32mm F/1.4 STM EF-M 22mm Canon Lenses
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Well known lens testing site Photozone reviewed the Canon EF-M 22mm f/2 STM pancake lens.

Canon did a good job once more. The Canon EF-M 22mm f/2 STM may be a tiny lens but it is an impressive performer nonetheless. The center quality is great throughout the relevant aperture range and the borders are also very impressive. There’s some softness in the image corners at large apertures though and this is somewhat emphasized by a bit of field curvature. Stopping down lifts the corner performance significantly. […] Image distortions are negligible and lateral CAs are well controlled. In critical scenes you may spot some purple fringing at f/2 but that’s rather normal for a such a large aperture lens. On the downside the vignetting is on the high side even when stopped down. The bokeh is Okay for a moderate wide-angle lens but you will notice some smearing effects in difficult scenes. Read the review.

The EF-M 22mm f/2 STM is a razor-sharp lens, and the one of the two interesting lenses for the EOS M system (the other one is the EF-M 11-22mm f/4-5.6 IS STM). At $160 it’s definitely a no-brainer. It’s my prefered lens on the EOS M3. Canon Watch’s EOS M3 review is here.

Unfortunately for us, Canon managed to release just four lenses for the EOS M system. However, there is a rumor suggesting Canon may soon announce a score of new EF-M lenses.

Canon EF-M 22mm f/2 STM: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA

EOS M3

[via Photozone ]

Deal Alert: Canon EOS M Kits at Amazon UK (EOS M & 22mm – £207, EOS M & 18-55mm & Speedlite 90EX – £221)

Canon EOS M

Excellent deal at Amazon UK. The Canon EOS M with the supersharp EF-M 22mm f/2 STM pancake lens on sale for £206.51 (white only). Another very good deal is the EOS M kit with the EF-M 18-55mm IS STM lens and the Speedlite 90EX, on sale for £221.10 (silver). All EOS M kits on sale at Amazon UK are listed here.

I have the EOS M (and all lenses, plus adapter) and I love it. You get DSLR performance in a small and lightweight camera. The EOS M with the 22mm pancake lens is a no brainer, a kit you can always carry in your pocket.

[via EOS-M World]