Canon released firmware updates for five telephoto lenses. Here they are.
Please note: we linked Canon Japan (machine translated) because they are the first to publish the firmware updates.
Have fun…
New Canon patent for you, ladies and gentlemen. Canon patent application 2024009238 (Japan, published 01/19/2024) discusses optical formulas for three telephoto prime lenses, all for fullframe mirrorless cameras.
From the patent literature:
Example 1
Example 2
Example 3
All featured Canon patents are listed here.
[via asobinet]
A new Canon patent for telephoto lenses with built-in teleconverter. For what mount? RF mount.
Canon patent 2022142979 (Japan, published 10/3/2022) discusses optical formulas for three telephoto lenses with built-in teleconverter. The lenses are 300mm f/2.8, 400mm f/2.8 and 600mm f/2.8. From the patent literature (machine translated):
An object of the present invention is to provide an optical system having a variable power optical system that is inserted into and removed from a main optical system, and to achieve good optical performance while reducing the weight of the entire system.
Description of the Related Art
As a method for changing the focal length of an optical system used in an imaging apparatus, there is a converter method that changes the focal length of the entire system by inserting a variable magnification optical system (extender) in the optical path.
When adopting a system incorporating a variable magnification optical system, in order to achieve good optical performance while reducing the weight of the entire system including the variable magnification optical system, the insertion position of the variable magnification optical system must be appropriately selected. It is important not only to do so, but also to properly configure the main optical system. The invention disclosed in Patent Document 1 has room for improvement from the viewpoint of achieving both weight reduction and optical performance.
Summary of the invention
It is an object of the present invention to achieve good optical performance while reducing the weight of the entire system in an optical system having a variable magnification optical system that is inserted into and removed from a main optical system.
Example 1 ML
Example 1 with teleconverter
Example 2 ML
Example 2 with teleconverter
More Canon patents are listed here.
[via asobinet]
Ready for the start of the week, here is a new Canon patent application for RF mount lenses.
A new Canon patent application discusses optical formulas for three RF mount lenses:
PROBLEM TO BE SOLVED: To obtain an optical system which is lightweight and has chromatic aberration and other aberrations satisfactorily corrected.
Example 1
Example 2
Example 3
This patent application might indeed lead to lenses that will be on sale one day.
The Canon patent application was spotted by asobinet. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:
A new Canon patent application was spotted. 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender 1.4x are discussed.
Canon patent application 2022-22771 discusses optical formulas for two rather interesting lenses:
PROBLEM TO BE SOLVED: To provide an optical system in which a magnification conversion optical group can be inserted and removed and the total length is short.
As a method of changing the focal length of the optical system used for imaging, there is a method of inserting a magnification conversion optical group such as an extender into the optical path . Further, as an optical system in which the total length (distance from the optical surface on the object side to the image surface) does not change due to the insertion / removal of the magnification conversion optical group, Patent Document 1 describes the axial light beam between the aperture stop and the image surface. An optical system capable of inserting and removing a magnification conversion group at a converging position is disclosed.
However, if a space for inserting the magnification conversion optical group is provided between the aperture diaphragm and the image plane as in Patent Document 1, the total length of the original optical system becomes long . Further, if the magnification conversion optical group is inserted in a narrow space, various aberrations of the optical system may increase. The
present invention provides an optical system in which a magnification conversion optical group can be inserted and removed, but the total length is short and good optical performance can be obtained.
Example 1
Example 1 (with inserted teleconverter)
Example 5
Example 5 (with inserted teleconverter)
The Canon patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:
Somewhat unusual yet rather interesting comparison between the Olympus 300mm f/4 and Canon RF 600mm f/11 lenses.
Our friends at Mirrorless Comparison compared the Olympus 300mm f/4 and Canon RF 600mm f/11 lenses for wildlife and bird photography. The former is for Micro Four Thirds and the latter for full frame. From their conclusion:
Traditionally, micro four thirds has always been the system we mention when talking about travelling light and reducing size and weight. On the other hand, full frame is supposed to be the system with the big heavy lenses, but also superior image quality. Well, in our case here, some of these claims can be challenged (with a few catches).
The RF 600mm F11 (and 800mm F11) is a brilliant idea from Canon. I was interested when they announced it, then I was skeptical about the aperture, but now I’m happy to say I really enjoyed taking pictures with this lens, and I quickly forgot about the slow aperture. I was using something very light, with excellent quality, autofocus and stabilisation. I thought there would be more tradeoffs than that.
[…]Where does that leave the Olympus solution then? Well, rest assured, it is still a very strong competitor. The faster aperture of the 300mm Pro easily makes up for the smaller sensor, you get a premium build quality with weather sealing, state of the art stabilisation and a few welcome features like being able to focus much closer to small subjects, which adds to the lens’ versatility.
Read the review at Mirrorless Comparison
More comparison reviews are listed here.
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