Canon patent for EF-S 55-200mm f/4-6.3 STM lens

EF-S 55-200mm

Canon patent for an EF-S 55-200mm f/4-6.3 STM lens. No mention of IS in the patent, that’s weird. For the time being there is an EF-M 55-200mm IS STM lens for the EOS M system.

Hard to say if this patent will ever hit the market. A similar telephoto lens for EF-S mount exists, the similar specced EF-S 55-250mm f/4-5.6 IS STM. Note that the optical formula in the Canon patent mentions an f/6.3 max aperture at telephoto lens. Could be another kit lens option, or just one of the many patents filed by Canon.

  • Patent Publication No. 2015-197655
    • Published 2015.11.9
    • Filing date 2014.4.3
  • Example 1
    • Zoom ratio 3.68
    • Focal length 54.36 133.00 199.99
    • F-number 4.14 5.22 6.32
    • Half angle of 14.11 5.86 3.91
    • Image height 13.66
    • Overall length of the lens 129.39 161.77 167.04
    • BF 46.78 66.90 78.18
[via Egami]

Canon patent for ND filter with antireflection coating

canon patent

Canon patent for an ND (Neutral Density) filter with antireflection coating. This patent may lead to a high performing ND filter with minimal image quality degradation.

  • Patent Publication No. 2015-200805
    • Published 2015.11.12
    • Filing date 2014.4.9
  • Canon patents
    • On the surface of the transparent substrate made of synthetic resin, deposited the inorganic hard film of fine uneven periodic structure
    • The refractive index changes toward the surface layer side from the transparent substrate side
[via Egami]

Canon patent for 20-45mm f/2.8-4 lens

20-45mm

Canon filed a patent for a 20-45mm f/2.8-4 lens. Somewhat unusual specs, but who knows.

  • Patent Publication No. 2015-197593
    • Published 2015.11.9
    • Filing date 2014.4.1
  • Example
    • Zoom ratio 2.25
    • Focal length f = 20.00 23.60 45.00
    • Fno. 2.75 2.90 4.16
    • Half angle of 47.25 42.51 25.68
    • Image height 21.64 21.64 21.64
    • Overall length 158.28 156.32 173.36
    • BF 42.05 46.10 73.14
[via Egami]

Canon patent for 24-300mm f/4-5.6 lens

canon patent

Canon filed a patent for a 24-300mm f/4-5.6 lens.

  • Patent Publication No. 2015-200870
    • Published 2015.11.12
    • Filing date 2014.3.31
  • Example 1
    • Zoom ratio 12.14
    • Focal length 24.30 99.98 294.95
    • F-number 4.10 5.76 5.88
    • Half angle (in degrees) 41.68 12.21 4.20
    • Image height 21.64
    • Overall length of the lens 197.38 245.98 298.53
    • BF 38.90 91.95 92.55
[via Egami]

Canon patent for LCD viewfinder through magnifying glass

2015_171116_fig012015_171116_fig02

Canon patent for a LCD viewfinder that’s turned on by putting a magnifying glass on the rear display. Sort of EVF on the cheap.The display area on the LCD display is reduced to work with the magnifying glass (that acts as viewfinder). If you look at the images above you can see what I mean. The viewfinder is flipped on the LCD display. If we will ever see this go into production it will likely be featured on entry level cameras.

  • Patent Publication No. 2015-171116
    • Published 2015.9.28
    • Filing date 2014.3.11
  • Canon patents
    • Touch panel display
    • The touch panel display viewfinder if touched, changing the display area
    • Finder to return to the original full-screen display If you had to leave
    • Or finger touches, finder to identify whether touches
[via Egami]

Canon patent for 28-200mm f/3.5-5.6 lens

canon patent

Canon patent for a 28-200mm f/3.5-5.6 lens. Not sure where to put this optical formula. Looks like a budget super-zoom.

  • Patent Publication No. 2015-172612
    • Published 2015.10.1
    • Filing date 2014.3.11
  • Example 1
    • 1
    • Zoom ratio 6.68
    • Focal length 28.90 51.17 193.10
    • F-number 3.63 4.39 5.88
    • Half angle (in degrees) 36.82 22.92 6.39
    • Image height 21.64 21.64 21.64
    • Overall length of the lens 132.70 149.90 182.70
    • BF 39.40 49.73 66.13,
[via Egami]