A Patent was filed for a Sigma 8mm f/1.0 and a Sigma 15mm f/1.2. The Sigma 15mm f/1.2 is full frame, while the Sigma 8mm f/1.0 is either m43 or APS-C. These lenses probably won’t come out anytime soon, but you can see renderings of them above or read the patent below:
overview
- [Publication number] P2025099854
- [Release date] 2025-07-03
- [Name of invention] Large aperture ratio ultra-wide-angle lens
- [Application date] 2023-12-22
- [Applicant]
[Identification number] 000131326
[Name or company name] Sigma Corporation
- To provide a large aperture ratio ultra-wide angle lens that is compact and lightweight, has a half angle of view of 80 degrees or more, is bright with an F-number of approximately 1.8 or less, and has good optical performance from the center to the periphery of the screen while ensuring a sufficient image circle.
- [Background Art]
[0002]
In recent years, as digital cameras and video cameras have become mirrorless, and as smart phones and mobile data terminals have become equipped with high-performance cameras, digital cameras equipped with large sensors of 35 mm full-size format or larger have become mainstream in order to differentiate themselves from these mobile devices. Similarly, in the photographic optical systems used in imaging devices, there is an increasing demand for ultra-wide-angle lenses with bright F-values and large aperture ratios in order to differentiate them from smartphones and other devices.
- [0004]
Patent Documents 1 and 2 describe examples of large aperture ratio ultra-wide-angle lenses having a maximum angle of view of approximately 160 degrees or more and an F-number of approximately 1.8 or less.
- [0006]
Ultra-wide-angle lenses with a maximum angle of view of approximately 160 degrees or more often have a retrofocus type lens configuration, and often have a configuration in which a concave meniscus lens with a convex surface facing the object side is arranged closest to the object side. In such optical systems, the concave meniscus lens arranged closest to the object side often has a large thickness ratio and a concave surface that is close to a hemisphere, and may account for more than 50% of the total lens weight of the entire optical system. If the F-number is reduced, the lens diameter becomes large, and the weight of the optical system increases rapidly. When attempting to achieve a large aperture ratio, it is important to achieve high performance while preventing the lens from becoming too large.
- [0007]
Patent Document 1 includes an example of a bright, large aperture ratio super wide-angle lens with a maximum angle of view of 160 degrees or more and an F-number of 1.6 or less. The large aperture ratio super wide-angle lens described in Patent Document 1 has high optical performance, but has a small image circle, and is an extremely large optical system in terms of the size of the optical system relative to the image circle, which poses a problem in terms of miniaturization.
- [0009]
The present invention has been made in consideration of the above-mentioned problems, and aims to provide a large aperture ratio ultra-wide-angle lens which is compact and lightweight, has a half angle of view of 80 degrees or more, is bright with an F-number of approximately 1.8 or less, and has good optical performance from the center to the periphery of the screen while ensuring a sufficient image circle.
- [Effects of the Invention]
[0011]
According to the present invention, it is possible to provide a large aperture ratio ultra-wide angle lens that is compact and lightweight, has a half angle of view of 80 degrees or more, is bright with an F-number of approximately 1.8 or less, and has good optical performance from the center to the periphery while ensuring a sufficient image circle.
Example 1
- Focal length: 8.15
- F-number: 1.26
- Angle of view: 185.73
- Image height: 11.94
- Total length: 133.27
Example 2
- Focal length: 8.15
- F-number: 1.03
- Angle of view: 185.73
- Image height: 11.93
- Total length: 149.99
Example 3
- Focal length: 15.50
- F-number: 1.46
- Angle of view: 185.73
- Image height: 22.39
- Total length: 168.50
Example 6
- Focal length: 15.29
- F-number: 1.26
- Angle of view: 185.73
- Image height: 22.11
- Total length: 163.26
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