A new Canon patent application for RF mount lenses with "Defocus Smoothing" (DS) optical technology.…
And here we have another Canon patent published today.
Canon patent application 2023099385 (Japan, published 7/13/2023) discusses optical formulas for a RF 200mm f/2 IS lens.
From the patent literature:
To provide an optical system having a plurality of focusing groups and anti-vibration groups that can be made compact and lightweight in addition to excellent optical performance.
Description of the Related Art
In a telephoto lens equipped with a plurality of focusing groups that move during focusing from infinity to the closest object and a vibration reduction group for correcting image blur, in addition to good optical performance, There is a demand for miniaturization and weight reduction of the entire lens system.
The present invention provides an optical system having a plurality of focusing groups and anti-vibration groups, which can be reduced in size and weight in addition to excellent optical performance.
- Focal length: 195.00
- F-value: 2.05
- Half angle of view: 6.33
- Image height: 21.64
- Overall length: 184.49
- Back focus: 22.35
More Canon patents are listed here.