Sigma 25mm f/1.2 lens patented for Micro Four Thirds cameras

Sigma has patented a 25mm f/1.2 lens designed for Micro Four Thirds cameras.

The patent application is describing a bright wide-angle prime optic developed by Sigma for mirrorless cameras with Micro Four Thirds cameras. If becomes real the Sigma 25mm f/1.2 will be great for users of Micro Four Thirds system.

However we have to underline that this is only the patent application, so don’t expect the product become available on the market in the near future.

It is also mentioned that Sigma has most likely designed this optic for Olympus. More details about the Sigma 25mm f/1.2 lens can be found below. 

Sigma 25mm f/1.2 lens patent details

Sigma 25mm f/1.2 lens patented for Micro Four Thirds cameras

The M.Zuiko Digital 25mm f/1.8 lens which was announced at the beginning of 2014, is made out of 9 elements into 7 groups with two aspherical elements, just like the ones in the Sigma 25mm f/1.2 lens patent application. Meaning that there is a strong possibility that Sigma has designed this optic for Olympus, which could launch an f/1.2 version, too.

Explanation self interpretation of patent literature

  • Patent Publication No. 2015-75501
    • Published 2015.4.20
    • Filing date 2013.10.4
  • Example
    Example Focal distance Fno. Total angle of view
    One 24.53 1.82 48.10
    Two 25.00 1.80 47.37
    Three 30.00 1.81 39.62
    Four 17.12 1.82 64.97
    Five 24.53 1.80 47.01
    Six 24.53 1.20 47.06

    Image height Y = 10.80mm

  • Sigma patents
    • 3-group configuration of positive positive and negative
    • Inner focus (the second group)

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