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Canon patents new superzoom APS-C lens – but what mount is it for?

Canon patent
(Image credit: Canon)

Canon is known for being one of the most prolific companies for producing patents, filing several every year. However, one of its latest patents is causing a bit of a stir.  Canon has recently filed a patent for superzoom lens designed for APS-C cameras. 

However, it's not clear whether Canon has designed this lens for an as-yet-unannounced APS-C RF camera, or whether it's for its existing APS-C EOS M mirrorless mount. 

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As reported by Canon News, this patent shows an 18-240mm superzoom lens that features a variable aperture range from f/4 to f/8. One of the benefits of using a variable aperture range is that manufacturers are able to have a wide focal length range while still maintaining a compact design. 

This design is actually a little similar to Canon's recent super telephotos, the Canon RF 800mm f/11 and the Canon RF 600mm f/11. While admittedly cost effective, the narrow minimum apertures of f/11 on these lenses means that they aren't able to gather as much light as some wider aperture options. 

So, which kind of mount could this Canon 18-240mm f/4-f/8 lens be for? Canon News suggests that this might not be intended for an RF mount APS-C camera, as the patent shows a very short back focus. This could mean that we'll soon be seeing this brand new superzoom in the EOS M line-up.

While it's always great to see Canon producing new and interesting patents, it's worth remembering that a patent registration doesn't necessarily mean that we'll see the product come to market. However, we'll certainly be interested to see whether this unusual superzoom makes the cut.

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Usman Dawood

Usman is a commercial photographer based in West Yorkshire. Geometry and art have always been a huge passion for him. He finds the structured lines and discipline of architecture immensely appealing, which is why photographing it made complete sense. The incredible works of architects such as Zaha Hadid and Santiago Calatrava are a huge source of inspiration. Usman was previously a senior writer at and