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Canon has published a series of 3 patent applications at the same time dealing with super-telephoto zooms. I know we have recently covered a similar patent application not so long ago, and that usually precludes me from writing up yet-another-article on this. Personally, I’m always curious when they do multiple submissions at the same time. It takes a lot of time to create a patent application. Between the author, lawyers, and the skull-numbing bureaucracy of the various patent offices you need to deal with – it’s usually not something you do without some kind of reason. Yes, it could be defensive which means they don’t want anyone else from creating the item discussed in the patent application, but that’s rarely a set of 3 patent applications.
Not only that, all three patents combine to form a complete picture of these lenses. So I happen to think the series of patent applications is noteworthy.
Japan Patent Application 2023-135180
This patent application discusses the design of a small, lightweight telephoto zoom lens, in particular, it’s focused (no pun intended) on the fourth element group to increase the optical performance while focusing.
The lens design embodiments mentioned are;
Canon RF 200-800mm F5.6-9.0
Canon RF 200-1000mm F5.6-11.0
Canon RF 200-800mm F5.6-8.0
Japan Patent Application 2023-135181
This patent application discusses the optical element design of a super-telephoto zoom to have a small size and good optical performance. Given the focal ranges talked about in the embodiments I should mention that “small size” is relative here, but still impressive with the 300-1000mm zoom lens being 420mm in length.
The lenses in the embodiments are as follows;
Canon RF 150-600mm F5.0-6.3
Canon RF 200-800mm F5.6-9.0
Canon RF 300-1000mm F6.3-9.0
Canon RF 300-800mm F5.6-9.0
Canon RF 200-500mm F5.6-6.3
Canon RF 200-400mm F4.0
Japan Patent Application 2023-135182
In this application, the addition of image stabilization is added to the lens designs. Good news for those who were worried about hand-holding a 300-1000mm lens without IS.
The lenses discussed in the embodiments include;
Canon RF 200-800mm F5.6-9.0
Canon RF 200-1000mm F5.6-9.0
Canon RF 150-600mm F5.0-6.3
Canon RF 200-600mm F5.0-6.3
Canon RF 200-400mm F4.0
In all a series of interesting patent applications. As with all patent applications, they may not end up in an actual patent, or products. However, it does give us an idea about what Canon is researching.
Source: Japan Patent Application 2023-135180
Source: Japan Patent Application 2023-135181
Source: Japan Patent Application 2023-135182
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