Skip to content

Canon Patent: RF 24-300mm f/2.8-5.6 IS, RF 24-240mm f/2-5.6 IS And RF 40-350mm f/2.8-5.6 IS

Canon Patent

And another Canon patent for lenses for the RF mount.

Canon patent application 2023104137 (Japan, published 7/28/2023) discusses optical formulas for three zoom lenses for the RF mount:

  • RF 24-300mm f/2.8-5.6 IS
  • RF 24-240mm f/2-5.6 IS
  • RF 40-350mm f/2.8-5.6 IS

From the patent literature:

A zoom lens, an imaging device having the same, and an imaging system

To provide a zoom lens that is compact as a whole, has a high zoom ratio, and has high optical performance over the entire zoom range.


In recent years, there has been a demand for a zoom lens used in an imaging apparatus having an imaging device to have a compact overall system, a high zoom ratio, and high resolution (high optical performance). . In particular, zoom lenses are required to have high optical performance with substantially uniform resolving power from the center of the screen to the periphery of the screen.

However, in the zoom lenses disclosed in Patent Documents 1 and 2, since the relationship between the refractive powers of the lens groups is not appropriate, the lens size increases when the zoom ratio is increased, and astigmatism at the wide-angle end and coma at the telephoto end gets worse.

The present invention provides a zoom lens that is compact overall, has a high zoom ratio, and has high optical performance over the entire zoom range.

More Canon patents are listed here.

[via asobinet]

Back To Top


This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy.
By closing this banner you agree to the use of cookies.