Sigma 70-200mm F2.8 DG DN OS Patents Found

• 8 months ago

Sigma 70-200mm f/2.8 DG DN OS Sports

B&H Photo / Amazon / Adorama

The Sigma 70-200mm F2.8 DG DN OS has already been announced, but the patents were just filed and found.

overview

• [Publication number] P2025043459
• [Release date] 2025-04-01
• [Name of invention] Large aperture ratio telephoto zoom lens
• [Application date] 2023-09-19
• [Applicant]
  
  [Identification number] 000131326
  
  [Name or company name] Sigma Corporation
• According to the present invention, there is provided a large aperture ratio telephoto zoom lens having high optical performance, which is compact and lightweight while being equipped with an anti-vibration mechanism and a quiet and high-speed focus mechanism.
• [Background Art]
  
  [0002]
  
  In recent years, the number of pixels in digital cameras has increased and pixel density has increased, and so zoom lenses with high optical performance are in demand. In particular, in order to resolve images up to high spatial frequencies, it is desirable to reduce various aberrations. However, in general, the larger the aperture ratio, the more difficult it becomes to suppress aberrations.
• [0003]
  
  In addition, the larger the aperture ratio, the larger the lens diameter, making it difficult to reduce the weight of the lens. In particular, in a telephoto zoom lens with a large aperture ratio, the focus lens group tends to be heavy, and it becomes necessary to use a large actuator to achieve quiet and high-speed focus drive. However, using a large actuator goes against the weight reduction of the zoom lens. Therefore, by making the focus lens group smaller and lighter, quiet and high-speed focus drive is realized without making the actuator larger (for example, Patent Document 2).
• [0004]
  
  Similarly, the larger the aperture ratio, the heavier the anti-vibration lens group tends to be, making it necessary to use a large actuator. However, by making the anti-vibration lens group smaller and lighter, it is possible to achieve high tracking performance of the anti-vibration drive (movement of the imaging position by shifting the anti-vibration lens group) without making the actuator larger (for example, Patent Documents 1 and 2).
• [0009]
  
  The present invention has been made in consideration of the above-mentioned circumstances, and has as its object to provide a large aperture ratio telephoto zoom lens having high optical performance, which is equipped with an anti-vibration mechanism and a quiet and high-speed focus mechanism, while also being compact and lightweight.

Example 1

• Focal length: 72.10-194.00
• F-number: 2.91-2.92
• Angle of view: 32.93-12.18
• Image height: 21.63
• Overall length: 222.00

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