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Firmware Update

Sigma Patents 17-55mm F2.8 OS Lens

A new patent surfaced over the web that shows Sigma 17-55mm lens having a constant aperture range of F2.8 and built-in optical image stabilization, According to the website egami the built of the lens and its specification look more video oriented,  the to be announced 17-55mm F2.8 lens may become a standard lens for upcoming Canon and Nikon 4K / 8K  DSLRs.


More Sigma ART Lenses Coming

Latest patent literature suggest that the Sigma is working on high quality ART Series zoom lenses for APS-C format DSLR, take a look at the list below


List of Upcoming ART Lenses from Sigma for APS-C DSLRs

  • 15-30 mm F1.8
  • 17-35mm F1.8
  • 16-50 mM F2.8
  • 12-24mm F2.8

Sigma is 18-35mm F1.8 is already announced by Sigma and available for Canon, Nikon and Sony Mount – Available for purchase at Amazon and B&H Store

src – egami

Sigma 35mm F1.4 Lens Patent


The 35mm F1.4 OS Lens patent surfaced over the web, the lens is made for fullframe camera and features built-in image stabilization, patent details below

Description and self-interpretation of the patent literature

  • Patent Publication No. 2014-48488
    • Publication date 2014.3.17
    • Filing date 2012.8.31
  • Example 6
    • Focal length f = 35.58mm
    • Fno. 1.45-1.68
    • Angles of view 2ω = 63.08-58.94 °
    • Image height Y = 21.60mm
    • The overall length of the lens 135.98mm
    • Mod. 300mm
    • 13 pieces of 11-group lens configuration
    • Two two-sided aspherical
    • One FLD
    • Rear focus
  • Example 9
    • Focal length f = 33.53mm
    • Fno. 1.45-1.67
    • Angles of view 2ω = 66.32-59.89 °
    • Image height Y = 21.63mm
    • The overall length of the lens 135.98mm
    • Mod. 300mm
    • 13 pieces of 11-group lens configuration
    • Two two-sided aspherical
    • Three ELD
    • Rear focus
    • Anti-vibration (Group 3)

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New Foveon Sensor Patent By Sigma

The big problem that Sigma was facing with its Foveon Sensor technology was noise, the previous generation of Foveon sensor show excellent color output at base ISO but significant amount of visible noise starts at ISO 1600 and image become unusable at ISO 3200.

Now Sigma patent a new type of sensor technology that composed of normal and highlight pixels to capture more light and create less noise at High ISO range.


For more details take a look below (machine translated)

  • Patent Publication No. 2013-81154
    • Publication date 2013.5.2
    • Filing date 2011.7.26
    • Applicant Fobeon, Inc.
    • U.S. Provisional Patent Application No. 61/511, 661 No.
  • Foveon patent
    • With pixels having different sensitivities imaging device
      • First pixel usually pixel
      • Second pixel highlight pixels
      • Opening is narrow, (saturation is slow) sensitivity is low highlight pixel
    • To correct overexposure by referring to the second pixel of the peripheral pixel overexposure
      • And the average value of the pixels which are not overexposed, the ratio of the pixel overexposure and weighted average

Also see more details about recently announced sigma dp series camera with optimized high performance APS-C sensor – Sigma DP2 Quattro – Price and Press Release

Sigma patents 25 mm F1.4 M4/3 Lens

Sigma patent a 25 mm F1.4 micro four third lens, the patent is spotted by patent hunting blog Egami.

Patent Details

  • Patent Publication No. 2013-3324
    • 2013.1.7 Release Date
    • Filing date 2011.6.16
  • Example 2
    • Focal length f = 25.00mm
    • Fno. 1.44
    • 2ω = 48.61 ° angle of view
    • Nine lens elements in 7 groups configuration
    • Two three-sided aspherical
    • (More than n = 2.00) one high refractive index glass
    • Four groups of positive and negative positive negative
    • Inner Focus (group 3)