Canon Patent: 35mm f/1.4 Lens – Successor of The EF 35mm f/1.4L On Its Way?

Canon Patent

This could be the patent for the Canon EF 35mm f/1.4L II lens. Egami (translated) spotted a patent filed by Canon that’s related to a 35mm f/1.4 lens that appears to refer to the successor of the Canon EF 35mm f 1.4L USM (price & specs) lens (released in 1998). Not the first patent for a 35mm lens, and there was a rumor that Canon was field-testing a EF 35mm f/1.4L II lens. More after the break.

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Canon Patent: 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 Lenses

Canon Patent

New APS-C superzooms coming?

Egami (translated) spotted a new Canon patent. The patent refers to 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 lenses.

Description and self-interpretation of the patent literature

  • Patent Publication No. 2013-190453
    • Publication date 2013.9.26
    • Filing date 2012.3.12
  • Example
    embodiment
    No. Focal length Fno. Half angle Lens constitution Aspheric surface UD glass
    One 18.75 – 59.52 – 270.67 3.18 – 4.69 – 5.88 36.08 – 12.93 – 2.89 19 pieces of 14 group Three 3 surface Three
    Three 18.67 – 54.99 – 299.50 3.39 – 4.79 – 5.88 36.18 – 13.95 – 2.61 21 pieces of 16 group Four 4 surface Three
    Four 18.54 – 49.15 – 194.16 3.22 – 4.22 – 5.66 36.36 – 15.52 – 4.02 18 pieces in 11 groups Two 2 surface Three
    Six 16.53 – 54.38 – 237.95 3.42 – 4.72 – 5.88 39.56 – 14.10 – 3.29 18 sheets 13 group Four 4 surface Two
    Seven 16.81 – 47.39 – 194.13 3.32 – 4.46 – 5.66 39.07 – 16.07 – 4.02 17 pieces of 12 group Two 2 surface Two
  • Canon patent
    • 6-group zoom of positive and negative positive and negative positive and negative
    • Rear focus
Canon Patent
From left to right: spherical aberration, astigmatism, distortion, lateral chromatic aberration.
[via Egami]

Canon Patent: 24-70mm f/2.8 Image Stabilized Lens

There has been a rumor about a Canon 24-70mm f/2.8 IS lens surfacing last year, now Egami (translated) spotted a related patent (referring also to a 28-80 f/2.8 IS lens). This could be a very exciting lens!

  • Patent Publication No. 2013-182246
    • Publication date 2013.9.12
    • Filing date 2012.3.5
  • Example 1
    • Zoom ratio 2.75
    • Focal length f = 24.70-36.42-67.88mm
    • Fno. 2.91
    • Half angle ω = 41.22-30.71-17.68 °
    • Image height 21.64mm
    • 164.87-172.85-196.79mm overall length of the lens
    • BF 39.07-44.44-54.56mm
    • 20 pieces of 13-group lens configuration
    • Four four-sided aspherical
  • Example 2
    • Zoom ratio 2.76
    • Focal length f = 24.70-34.88-68.18mm
    • Fno. 2.91
    • Half angle ω = 41.22-31.81-17.61 °
    • Image height 21.64mm
    • 165.79-174.26-199.67mm overall length of the lens
    • BF 38.47-42.81-58.00mm
    • 20 pieces of 15-group lens configuration
    • Three 3 aspherical surface
  • Example 3
    • Zoom ratio 3.22
    • Focal length f = 24.70-39.67-79.43mm
    • Fno. 2.91
    • 41.22-28.61-15.24 ° angle of view
    • Image height 21.64mm
    • 161.98-171.74-200.99mm overall length of the lens
    • BF 38.35-46.17-57.64mm
    • 20 pieces of 13-group lens configuration
    • Four four-sided aspherical
  • Canon patent
    • 5-group zoom of positive and negative positive positive and negative
    • Antivibration (fourth lens group)

Canon Patent: 50mm f/1.8 Image Stabilized Lens

Egami (translated) spotted a Canon patent for a 50mm lens with f/1.8 and image stabilization. The patent does in some way fit with a rumor regarding a new image stabilized Canon 50mm lens said to be announced in 2013. Another Canon patent for a 50mm lens I reported about can be seen here. Canon has three 50mm lenses in their line-up: the EF 50mm f/1.2L, EF 50mm f/1.4 and the inexpensive EF 50mm f/1.8. The lens described in the patent will not replace the 50mm f/1.2L nor the 50mm f/1.8, most probably it will replace the 50mm f/1.4 (I don’t think Canon will add a fourth 50mm lens to their line-up).

  • Patent Publication No. 2013-142782
    • Publication date 2013.7.22
    • Filing date 2012.1.11
  • Example 1
    • Focal length f = 51.51mm
    • Fno. 1.85
    • Half angle ω = 22.78 °
    • Image height 21.64mm
    • The overall length of the lens 76.78mm
    • BF 37.84mm
    • 8 pieces of 7 lens configuration
  • Canon patent
    • (Optical system of the anti-vibration unit is located between the aperture and the front lens group) and vibration-proof

Canon Patent: More Pancake By Canon (45mm, 40mm, 35mm, 28mm, all f/2.8)

Canon Patent
45mm f/2.8
Canon Patent
35mm f/2.8
Canon Patent
40mm f/2.8
Canon Patent
28mm f/2.8

Japanese site Egami (translated) spotted new patents filed by Canon. All are for f/2.8 pancake lenses: 45mm, 40mm, 35mm, 28mm. Canon has two pancake lenses in their line-up: the EF 40mm f/2.8 STM and the EF-M 22mm f/2 STM

  • Patent Publication No. 2013-137411
    • Publication date 2013.7.11
    • Filing date 2011.12.28
  • Example
    embodiment
    Focal length Fno. Half angle Configuration length Total length BF
    One 45.00 2.80 25.68 20.00 57.99 37.99
    Two 39.00 2.80 29.02 23.50 62.50 39.00
    Three 35.00 2.80 31.72 25.00 63.01 38.01
    Four 28.00 2.80 37.69 27.00 65.00 38.00

    Image height = 21.64mm

  • Canon patent
    • The longer the focus back a Gaussian type, field curvature occurs
    • 2-group configuration positive positive, Gauss type

Perfomance:

Canon Patent
45mm
Canon Patent
35mm
40mm
28mm