The development of the Tamron 20-40mm f/2.8 was announced here, and the first leaked image is here. Now asobinet has come across the patent, which you can see translated below:
Overview
- [Public number] P2022131391
- [Publication date] 2022-09-07
- [Title of Invention] Zoom lens and imaging device
- [Application date] 2021-02-26
- [Applicant]
[Identification number] 000133227
[Name] Tamron Co. , Ltd.- A zoom lens having a large aperture, a small size, and high imaging performance, and an imaging apparatus having the zoom lens are provided.
- [0005]
By the way, compared to a single focal length lens, a zoom lens tends to be a dark lens because it has a large number of lenses. Constructing the two positive lens groups as one unit during zooming is advantageous in terms of reducing eccentric errors and manufacturing errors as described above. There are restrictions on miniaturization. For example, the zoom lenses disclosed in Patent Documents 1 and 2 have an Fno of about 5.8 at the telephoto end, and are not designed to have a large aperture. On the other hand, the zoom lens disclosed in Patent Document 3 has an Fno of 2.8 and a large aperture. However, in this zoom lens, a plurality of lens groups are moved during focusing, and the mechanism for moving the lens groups during focusing and zooming is complicated. Therefore, the zoom lens has not been sufficiently miniaturized.
Example 1
- Focal length: 28.838-53.342
- F-value: 2.91
- Image height: 21.633
Example 2
- Focal length: 24.719-43.645
- F-value: 2.91
- Image height: 21.633
Example 4
- Focal length: 20.600-38.798
- F-value: 2.91
- Image height: 21.633
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via asobinet
