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

Canon Patent: 85mm f/1.2, 85mm f/1.8, 135mm f/2, 50mm f/1.4

Canon Patent
50mm f/1.4
Canon Patent
135mm f/2
Canon Patent
85mm f/1.8
Canon Patent
85mm f/1.2

Egami (translated) spotted new patents for lenses filed by Canon: 85mm f/1.2, 85mm f/1.8, 135mm f/2 and 50mm f/1.4.

  • Patent Publication No. 2013-114133
    • Publication date 2013.6.10
    • Filing date 2011.11.30
  • Example
    embodiment
    Focal length Fno. The overall length of the lens BF Lens constitution
    One 85.00 1.24 122.56 38.35 10 pieces of six groups
    Two 83.30 1.80 116.11 39.11 10 sheets in 7 groups
    Three 132.30 2.06 162.67 43.23 10 sheets in 7 groups
    Four 51.70 1.41 87.84 38.94 7 group nine

    Image height Y = 21.64mm

  • Factors that chromatic aberration of magnification chromatic aberration or axial chromatic aberration occurs
    • Reducing the total length
    • Focal length for a long time
  • Glass material Abbe number 70-90, of 1.4-1.5 refractive index
    • Possible correction of axial chromatic aberration
    • Must increase a curvature, spherical aberration and curvature of field is generated
  • Canon patent
    • I use a glass material having an anomalous partial dispersion of the predetermined
    • Consisting of organic and inorganic compound
Performance
[via Egami]

Canon Patent: 70-200mm f/4 Lens (Canon EF 70-200mm f/4L II On The Way?)

Canon Patent

Egami (translated) spotted a patent filed by Canon that most probably refers to the next iteration of the Canon EF 70-200mm f/4L USM, released in 2006. Canon has another 70-200 in their lineup, the image stabilized EF 70-200mm f/4L IS.

canon patent
Performance
  • Patent Publication No. 2013-105131
    • Publication date 2013.5.30
    • Filing date 2011.11.16
  • Example 1
    • Zoom ratio 2.68
    • Focal length f = 72.11-131.37-193.4mm
    • Fno. 4
    • Half angle ω = 16.7-9.35-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 234.52mm
    • BF 50.12mm
  • Example 2
    • Zoom ratio 2.68
    • Focal length f = 72.14-130.58-193.38mm
    • Fno. 4
    • Half angle ω = 16.69-9.41-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 213.85mm
    • BF 39.96mm
  • Example 3
    • Zoom ratio 2.68
    • Focal length f = 72.11-132.09-193.4mm
    • Fno. 4
    • Half angle ω = 16.7-9.3-6.38 °
    • Image height 21.64mm
    • The overall length of the lens 233.51mm
    • BF 49.05mm
  • Existing techniques
    • If you have a single focus group is easy aberration There is a change in the RF and IF
  • Canon patent
    • Inner zoom
    • Inner focus
    • Floating
    • MOD 300mm
    • β (Tele) = -0.5