Sigma lenses have evolved over the years. Over the past decade or so, the company has rebranded itself and continued to demonstrate its dedication to the lenses it creates. Sigma has introduced a range of versatile zoom lenses and primes, offering a diverse selection of optics for photographers to work with. According to its new patent, the company appears to be working on two prime telephoto lenses that aim to offer an exceptional range to users.
According to Asobinet, the company published a patent P2025162727 on October 28, 2025, which shows the design of large aperture telephoto lenses: 200mm f2 DG OS and a 300mm f2.8. The document outlines optics that are said to achieve high performance while reducing the weight. Here are the specs:
Example 1
- Back focal length: 22.4456
- Focal length: 194.30
- F-number: 2.07
- Angle of view: 12.45
- Image height: 21.63
- Total length: 212.00
Example 2
- Focal length: 290.30
- F-number: 2.90
- Angle of view: 8.35
- Image height: 21.63
- Total length: 286.83
- Back focus: 29.5555
Filed in April 2024, the patent states that the company aims to address the challenges in the design, which means balancing a large aperture with portability. The company also states that as mirrorless cameras become lighter, they aim to ensure that their lenses can match this while delivering excellent image quality.
However, the 200mm looks very similar to the 200mm f2 DG OS, which was launched sometime this year. So, it is possible that research might have begun earlier. However, if the company plans to make another improvement, it must also reduce the aperture slightly more, perhaps offering f1.4 as an option. While it is a challenge design-wise, Sigma is capable of finding a solution for photographers.
As for the 300mm lens, it could serve as a successor to the 300mm f2.8 EX DG APO HSM, which was launched in 2013. However, that lens was heavy and huge, and considering how things have changed now, the company can introduce an offering for mirrorless cameras, such as Sony and Leica mounts.
As for photographers, there are fewer prime lens options available to them, especially those with a bright aperture. First-party lenses, if available, will be expensive, which may discourage sports and wildlife photographers from purchasing them. However, a third-party lens, whose performance can rival that of first-party lenses, will serve as a bridge for many serious enthusiasts. We must remember that a patent does not mean there will be a lens later on. But it’s good to see the direction the company is willing to take.
If realized, these lenses would mark a significant expansion of Sigma’s telephoto prime range, appealing to sports, wildlife, and event photographers who prioritize both speed and image quality. The patent’s emphasis on axial chromatic aberration correction suggests the use of FLD or SLD elements, materials that Sigma frequently employs to achieve clarity across the frame.