Canon Patent: 10-20mm f/4, 9-18mm f/4, And 11-22mm f/4 For RF mount

Canon Patent

A new Canon patent, and as almost all Canon patents of the last two or three years it is for RF mount lenses.

Canon patent 2023005851 (Japan, published 1/18/2023) discusses optical formulas for three wide angle lenses for the RF mount:

  • 10-20mm f/4
  • 9-18mm f/4
  • 11-22mm f/4

The 11-22mm in the list above could well be the already rumored 11-22mm lens. From the patent literature:

An object of the present invention is to realize a negative lead zoom lens that is compact and has a wide angle of view and yet has high optical performance in a wide zoom range.

Example 1

  • Focal length: 10.30-19.40
  • F-value: 4.12
  • Half angle of view: 62.03-48.12
  • Image height: 19.40-21.64
  • Overall length: 129.14-132.69
  • Back focus: 15.09

Example 2

  • Focal length: 9.27-17.46
  • F-value: 4.12
  • Half angle of view: 64.34-51.10
  • Image height: 19.30-21.64
  • Total length: 124.52-125.00
  • Back focus: 15.37

Example 3

  • Focal length: 11.33-23.28
  • F-value: 4.12
  • Half angle of view: 59.58-42.90
  • Image height: 19.30-21.64
  • Total length: 130.00-131.90
  • Back focus: 16.34

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

[via asobinet]

Black Friday Germany: Meike MK 12mm f/2.8 Ultra-Weitwinkel Canon EF-M – €159.20 (reg. €199, limited time)

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Tamron SP 15-30mm f/2.8 Di VC USD G2 Review (best bang for buck ultra-wide zoom)

Tamron SP 15-30mm F/2.8

Tamron SP 15-30mm f/2.8 Di VC USD G2 at ag glance:

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/2.8 to f/22
  • Three LD and Three Aspherical Elements
  • AX, eBAND, BBAR, and Fluorine Coatings
  • Ultrasonic Silent Drive Autofocus Motor
  • VC Image Stabilization
  • Moisture-Resistant Construction
  • Rounded 9-Blade Diaphragm
  • Rear Drop-In Gel Filter Holder
  • Compatible with TAP-in Console

The Phoblographer posted their full review of the Tamron SP 15-30mm f/2.8 Di VC USD G2 (Canon Mount).

From the conclusion:


– Fast maximum aperture

– Excellent image quality

– Versatile ultra-wide angle focal range

– Moisture resistance


– Not compatible with conventional lens filters

– Big and heavy

Although US$1,299 is certainly not an inconsequential sum of money, the Tamron SP 15-30mm f2.8 Di VC USD G2 is one of the best bang for your buck when it comes to ultra-wide angle zooms currently available on the market. While Tamron’s original 15-30mm f2.8 was an impressive lens in its own right, the addition of moisture resistance along with enhanced vibration compensation and improved lens coatings are certainly welcomed improvements. We just wish Tamron would put the lens on a diet so that it was less cumbersome to use, but that would probably require that they bend the laws of physics. With that said, we’d still recommend this lens to anyone that’s in the market for a versatile ultra-wide angle zoom lens.

The Phoblographer’s review comes with a huge set of sample pictures and analyses all optical aspects of the lens.

Tamron SP 15-30mm f/2.8 Di VC USD G2:

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