Sigma Patents For 35mm, 50mm, and 85mm F1.2 and F1.4 Lenses Found

• 2 months ago

Sigma 35mm F1.2 DG DN | Art: B&H Photo / Amazon / Adorama

Sigma 50mm f/1.2 DG DN Art: B&H Photo / Amazon / Adorama

The patents for the Sigma 35mm, 50mm, and 85mm F1.2 and F1.4 were found. The Sigma 85mm f/1.2 hasn’t been released yet.  You can check them out below:

overview

• [Publication number] P2025124346
• [Release date] 2025-08-26
• [Name of invention] Optical system
• [Application date] 2024-02-14
• [Applicant]
  
  [Identification number] 000131326
  
  [Name or company name] Sigma Corporation
• The present invention provides an optical system that achieves compactness and light weight while providing a large aperture ratio and effectively correcting various aberrations, including focus breathing and distortion, by appropriately arranging a focus group and an aspherical surface.
• BACKGROUND ART In recent
  
  years
  
  , with the increasing number of pixels in imaging devices such as digital still cameras and video cameras, there has been a growing demand for high optical performance with strong correction of various aberrations from infinity to close range.
• [0003]
  
  Furthermore, in recent digital cameras, the focusing accuracy of autofocus (hereinafter referred to as AF) has improved dramatically, making it possible to accurately focus even in bright optical systems with extremely narrow depth of field. As a result, it has become possible to shoot video while maintaining accurate focus even at maximum aperture, greatly expanding the range of visual expression. Therefore, there is a demand for optical systems that suppress changes in the field of view during focusing (hereinafter referred to as focus breathing) even in bright optical systems.
• On the other
  
  hand, in order to realize high imaging performance from infinity to close range, a method has been proposed in which two lens groups are moved along different trajectories during focus drive.
• [0008]
  
  The present invention has been made in consideration of the above circumstances, and aims to provide an optical system that is small and lightweight, while having a large aperture ratio and effectively correcting various aberrations including focus breathing and distortion, by appropriately arranging the focus group and aspherical surfaces.

Example 1

• Focal length: 48.27
• F-number: 1.24
• Angle of view: 47.90
• Image height: 21.63
• Total length: 123.38
• Back focal length: 17.4116

Example 2

• Focal length: 82.63
• F-number: 1.24
• Angle of view: 28.98
• Image height: 21.63
• Total length: 136.91
• Back focus: 17.1880

Example 3

• Focal length: 35.06
• F-number: 1.24
• Angle of view: 62.68
• Image height: 21.63
• Total length: 125.79
• Back focal length: 17.7164

Example 4

• Focal length: 48.89
• F-number: 1.43
• Angle of view: 48.85
• Image height: 22.50
• Total length: 102.43
• Back focal length: 17.1875

Example 5

• Focal length: 33.61
• F-number: 1.44
• Angle of view: 65.06
• Image height: 21.63
• Total length: 105.02
• Back focal length: 17.3099

Example 6

• Focal length: 83.29
• F-number: 1.46
• Angle of view: 28.78
• Image height: 21.63
• Total length: 110.01
• Back focal length: 16.0126

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