The previously rumored Canon RF 5.2mm f/2.8 L dual fisheye lens is now confirmed: Nokishita reports that this will be a "VR" lens and I don't think they mean "Vibration reduction" - this will probably be a new 360° lens for VR like in "Virtual Reality" (given the word "dual" in the description). Of course, there is a patent for something similar already:
- [Publication Number] Japanese Patent Application Laid-Open No. 2021-51282 (P2021-51282A)
- [Publication date] April 1, 2021 (2021.4.1)
- Description: Lens device and image pickup device
- [Applicant]
[Identification number] 000001007
[Name or name] Canon Inc. - [0002]
Patent Document 1, two optical systems are arranged in parallel spaced apart by a predetermined distance (base length), one of the stereoscopic imaging optical system in which two image circle is focused in parallel to the imaging device It is disclosed. The longer the baseline length, the stronger the stereoscopic effect can be felt by the viewer of the video. In addition, the baseline length at which a natural three-dimensional effect can be felt is determined according to the distance to the object, and when the baseline length is in the range of about 1/20 to 1/100 of the distance to the object, a natural three-dimensional effect is obtained. You can get a feeling. If the baseline length is longer than this range, the stereoscopic effect is too strong, while if the baseline length is shorter than this range, the stereoscopic effect is weakened. To change the baseline length, the two optics need to be closer to or farther from each other. However, when images of two optical systems are arranged side by side on one image sensor to form an image, the images cannot be separated beyond the light receiving range of the image sensor, and on the other hand, the two images cannot be brought close to each other so as to overlap each other. - [0006]
The average human eyes spacing is about 60 ~ 65 mm, to obtain a more natural stereoscopic feeling similar to the human eye, at the same it is necessary to use the optical system of the baseline length of the same degree. However, in order to realize this, it is necessary to make the aperture of the lens mount larger than 60 mm, so that the lens device and the image pickup device become large.
