Sigma patent: 14mm f/3.5 lens for APS-C mirrorless cameras

14mm f/3.5

It’s getting more and more interesting for mirrorless camera owners. Sigma filed a new patent for a 14mm f/3.5 lens for mirrorless cameras with APS-C sensors. According to the patent description this would be a zero-distortion lens, something we recently saw on a new Laowa lens.

  • Patent Publication No. 2016-139087
    • Published 2016.8.4
    • Filing date 2015.1.29
  • Example 1
    • INF 200mm
    • Focal length 13.98 13.28
    • F-number 3.53 3.54
    • Full angle of view 2ω 90.74 92.90
    • The image height Y 14.20 14.20
    • Overall length of the lens 89.25 89.25
    • BF 17.5750
    • Lens configuration 8 groups 10 sheets
    • 2 aspherical three sides
    • ED 1 ( sigma in ELD)
    • Fluorite 4 ( sigma in FLD)
  • Example 2
    • INF 200mm
    • Focal length 13.97 13.28
    • F-number 4.13 4.13
    • Full angle of view 2ω 90.90 92.68
    • The image height Y 14.20 14.20
    • Overall length of the lens 82.60 82.60
    • BF 17.6874
    • Lens configuration 8 groups 10 sheets
    • 2 aspherical three sides
    • ED 1 ( sigma in ELD)
    • Fluorite 4 ( sigma in FLD)
  • Sigma patents
    • FumakeTadashi
    • Inner focus (the second group)
[via Egami]

 

Tamron patent for 10-24mm f/3.5-4.5 DiII VC USD lens

Tamron 10-24mm
Tamron 10-24mm f/3.5-4.5 DI II VC USD

Another rather interesting Tamron patent. This time we have a Tamron 10-24mm f/3.5-4.5 DI II VC USD ultra wide-angle lens for APS-C DSLRs. The patent appears to point to the replacement for the Tamron SP AF 10-24mm f/3.5-4.5 DI II lens, which doesn’t feature image stabilisation.

  • Patent Publication No. 2016-126280
    • Published 2016.7.11
    • Filing date 2015.1.8
  • Example 1
    • f 10.303 15.199 23.483
    • FNO = 3.6 -. 4.1 – 4.6
    • 2ω = 111.70 – 86.59 – 62.07
  • Tamron patent
    • Negative positive and negative positive
    • Anti-vibration (third group)
    • Inner focus (rear group of the first group)
Tamron 10-24mm
Tamron SP AF 10-24mm f/3.5-4.5 DI II lens
[via Egami]

 

A full-frame EF 40-800mm F4.5-5.6 lens coming before 2020, Canon patent suggests? [CW3]

EF 40-800mm F4.5-5.6
EF 40-800mm F4.5-5.6

Update: Guess I got a bit overexcited on this. The patent literature refers to 2 optical formulas for full-frame and 2 for Powershot class of cameras. While it is possible that Canon may build such a lens for FF, an application for Powershot is much more likely. However, it’s a matter of fact that Canon works on such crazy ideas.

Canon patent for an EF 40-800mm F4.5-5.6 lens. It’s suggested this Canon patent could lead to a new EF 40-800mm F4.5-5.6 lens to be announced before the Olympic Games in Tokyo 2020, and, well, I think this is entirely possible so I rate it CW2 CW3.

  • Patent Publication No. 2016-128846
    • Published 2016.7.14
    • Filing date 2015.1.9
  • Example 1
    • Zoom ratio 19.42
    • Focal length 41.09 92.80 152.20 225.00 797.99
    • F-number 4.67 4.66 4.65 4.67 5.71
    • Angle of view 27.79 13.13 8.10 5.50 1.55
    • Image height 21.65
    • Overall length of the lens 489.32
    • BF 39.28
  • Canon patent
    • Inner zoom
[via Egami]

Canon patent for 15-75mm F2-5.6 image-stabilised lens for APS-C sensors

15-75mm F2-5.6

A Canon patent for a 15-75mm F2-5.6 lens with image stabilization surfaced. Although it is suggested that the patent refers to a Powershot camera with an APS-C sensor, I couldn’t find hints pointing to that.

  • Patent Publication No. 2016-126226
    • Published 2016.7.11
    • Filing date 2015.1.7
  • Example
    embodiment
    Example Zoom ratio Focal length F-number Half angle of view Image height Overall length of the lens BF The effective diameter of the front lens Lens constitution Aspheric surface UD
    One 4.72 16.27 35.14 76.80 2.47 3.61 4.82 34.88 21.24 10.09 11.34 13.66 13.66 80.00 82.60 95.00 6.28 12.78 16.54 34.00 11 12 sheets group 8 face five One
    Two 4.72 15.60 33.30 73.60 2.06 3.91 5.76 36.01 22.30 10.51 11.34 13.66 13.66 85.91 88.09 110.00 6.28 16.31 22.07 36.02 10 12 sheets group Six faces four
    Three 4.71 15.45 34.76 72.80 2.06 4.00 5.04 35.79 21.45 10.63 11.14 13.66 13.66 89.98 91.94 115.00 6.28 15.52 22.55 37.95 10 group 13 sheets 5-sided four
    Four 4.71 15.45 32.76 72.80 2.06 4.00 5.04 35.79 22.63 10.63 11.14 13.66 13.66 89.01 88.49 114.92 6.52 18.26 21.47 39.01 10 group 13 sheets 5-sided four One
    Five 4.71 15.45 31.78 72.80 2.06 4.00 5.04 35.79 23.26 10.63 11.14 13.66 13.66 89.22 86.34 114.55 6.28 17.70 20.68 39.00 10 group 13 sheets 5-sided four One
    Six 3.96 15.96 31.06 63.20 2.47 4.12 5.76 35.63 23.85 12.49 11.44 13.73 14.00 87.92 86.14 105.87 6.28 17.25 24.35 38.50 10 group 13 sheets 5-sided four One
  • Canon patent
    • Inner focus (Group 5)
    • Anti-vibration (group 4)
[via Egami]

Canon patent to avoid AF hunting through improved detection of AF errors

AF hunting

Canon patent for a method to avoid Auto-Focus hunting by improving the detection of AF errors. If I got it right, this is achieved by using a linear polarizer between the optics and the imaging sensor (any help appreciated). This should improve the detection of inconsistent AF measurements and hence reduce if not drop the so called “AF hunting”. According to the machine-translated patent literature, this is…

a technology that can detect the displacement direction and amount of focus without having to drive the focus group.

 

  • Patent Publication No. 2016-24391
    • Published 2016.2.8
    • Filing date 2014.7.23
  • Example 1
    • Zoom ratio 1.00
    • Focal length 293.46
    • F-number 2.93
    • Half angle of view (degrees) 4.22
    • Image height 21.63
    • Overall length of the lens 274.0
    • BF 59.13
  • Canon patent
    • When placed near squeezed retarder phase difference changes toward the periphery from the center, and a linearly polarized light having a vertical plane of vibration, the focus position of the direct polarized light having a horizontal oscillation plane deviates
    • Place the linear polarizer between the optical system and the imaging device, and polarization selection means
[via Egami]

 

Yet another Canon patent for the EOS M system, it’s an EF-M 16-50mm f/3.5-5.6 IS STM

EF-M 16-50mm f/3.5-5.6 IS STM

It appears Canon is filing one patent for EF-M lenses after the other. Here is another one for an EF-M 16-50mm f/3.5-5.6 IS STM lens.

I can’t say if this optical formula has something to do with the already available [shoplink 38577]EF-M 15-45mm f/3.5-6.3 IS STM[/shoplink] lens. Maybe it was a patent obn the road to the 15-45mm. However, Canon appears to be definitely commited to the [shoplink 6091]EOS M[/shoplink] system.

  • Patent Publication No. 2016-118658
    • Published 2016.6.30
    • Filing date 2014.12.22
  • Example
    • Zoom ratio 2.88
    • Focal length 16.51 21.00 47.49
    • F-number 3.49 3.77 5.80
    • Half angle of view (degrees) 39.61 33.04 16.05
    • Image height 13.66 13.66 13.66
    • Overall length of the lens 82.00 77.35 84.14
    • BF 10.70 10.70 13.31
[via Egami]