Patent: Canon RF 180mm f/3.5L Macro, RF 140mm f/3.5L Macro and RF 200mm f/4L Macro
Here is a new Canon patent application for RF-mount lenses.
As of September 30, 2021, Canon’s patent application has been published. It includes examples of telephoto macro lenses that are likely to be “RF 180mm F3.5 Macro”, “RF 140mm F3.5 Macro”, and “RF 200mm F3.5 Macro”.
Canon RF 180mm f/3.5L Macro USM
- Focal length 174.43mm
- F-number 3.50
- Half angle of view: 7.07°
- Image height 21.64mm
- Length of lens: 189.49mm
- BF 13.73mm
Canon RF 140mm f/3.5L Macro USM
- Focal length 140.00
- F number 3.50
- Half angle of view (°) 8.78
- Image height 21.64
- Overall length of optical system 177.49
- BF 35.17
- Magnification ∞ β = -1
Canon RF 200mm f/4L Macro USM
- Focal length 194.00mm
- F-number 4.00
- Half angle of view: 6.36°
- Image height 21.64mm
- Length of lens: 202.49mm
- BF 39.36mm
- [Publication Number] Japanese Patent Application Laid-Open No. 2021-152568 (P2021-152568A)
- [Publication date] September 30, 2021
- INDUSTRIAL APPLICABILITY: Optical system and imaging device
- [Application date] March 24, 2020
[Identification number] 000001007
[Name or name] Canon Inc.
- PROBLEM TO BE SOLVED: To provide an optical system which is suitable for a macro lens and can suppress aberration fluctuation.
The optical system of each embodiment has an aperture aperture SP2 as a main focus aperture that determines (limits) the light beam of the open F number (Fno), and a positive refractive power arranged on the object side of the aperture aperture SP2. It has a front focus group LPF, a rear focus group LPR having a positive refractive power arranged on the image side of the aperture aperture SP2, and a negative refractive power arranged on the image side of the rear focus group LPR. It has a posterior group LN. The “group” as used herein means each group of lenses whose spacing changes during focusing.
The Canon EOS R3 is now available for pre-order at major US stores, order now if you are interested.
Note: Join the Canon EOS “R” Series Facebook Group if you are interested.
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