Tamron 28-105mm f/2.8 Patent Found

• 11 months ago

Tamron 35-150mm f/2-2.8 Di III VXD:

B&H Photo / Amazon / Adorama

A Tamron 28-105mm f/2.8 patent has been found that is probably related to the release of the Tamron 35-150mm f/2-2.8 Di III VXD. Tamron might have been working on a more traditional lens and opted to create a more unique f/2 zoom.

overview

• [Publication number] P2024180681
• [Release date] 2024-12-26
• [Name of invention] Zoom lens and imaging device
• [Application date] 2024-10-22
• [Show division] Division of P 2021106602 
  
  [Original application date] 2021-06-28
• [Applicant]
  
  [Identification number] 000133227
  
  [Name or company name] Tamron Co., Ltd.
• A zoom lens that has a large aperture ratio, yet is small overall, and has excellent optical performance, and an imaging device having the zoom lens are provided.
• [Background Art]
  
  [0002]
  
  Imaging devices using solid-state imaging elements, such as digital still cameras and digital video cameras, are in widespread use. There are various types of such imaging devices, such as digital still cameras, digital video cameras, broadcast cameras, surveillance cameras, and vehicle-mounted cameras. In any imaging device, there is a strong market demand for zoom lenses with a large aperture ratio and high optical performance.
• [0005]
  
  In recent years, digital still cameras and the like that capture images using live view images have become widespread. When capturing images using live view, the image plane phase difference AF method or the contrast AF method is used to focus on the subject. In particular, in the contrast AF method, the focus group is constantly moved to focus on the subject. Furthermore, in recent years, digital still cameras and the like that employ tracking AF have also become widespread. Tracking AF refers to an autofocus function that, after focusing on the subject to be captured once, keeps the subject in focus at all times by moving the focus group in response to the movement of the subject.
• [0006]
  
  When using contrast AF or tracking AF to capture video images, the size of the subject on the imaging surface changes with the movement of the focus group. If the change in image magnification caused by the movement of the focus group is large, the photographer observing the live view image will feel uncomfortable. It is known that the change in image magnification becomes larger the closer the focus group is to the object side, that is, the further forward the focus group is located in the optical system. Therefore, it is necessary to appropriately set the location of the focus group.

Example 1

• Focal length: 36.0267-145.5296
• F value: 2.0604-2.9089
• Half angle of view: 30.9716-8.0578
• Image height: 21.6330

Example 3

• Focal length: 36.0059-145.7846
• F value: 2.9006-2.8998
• Half angle of view: 31.1279-8.1277
• Image height: 21.6330

Example 5

• Focal length: 28.8086-101.8857
• F value: 2.9114-2.9097
• Half angle of view: 38.4220-11.4289
• Image height: 21.6330

via asobinet