Canon Patent: RF-S 15-45mm F3.5-6.3 Lens For APS-C Imaging Sensors

Canon Patent

And here is another Canon patent application for the RF-S mount. Canon patent 2023182958 (Japan, published 2023-12-27) discusses optical formulas for a lens for the RF-S mount, 15-45mm F3.5-6.3.

From the patent literature:

  • An object of the present invention is to provide a zoom lens with good optical performance over the entire zoom range.
  • [Background Art] Conventionally, a lens has a first lens group with a negative refractive power and a second lens group with a positive refractive power, which are arranged in order from the object side to the image side, and includes a focal length in the standard range. Zoom lenses are known (see Patent Documents 1 and 2).
  • However, in the zoom lens disclosed in Patent Document 1, the entire lens system is large and it is not possible to achieve sufficiently high image quality. Furthermore, in the zoom lens disclosed in Patent Document 2, various aberrations such as spherical aberration and coma aberration are not sufficiently corrected.
  • An object of the present invention is to provide a zoom lens with good optical performance over the entire zoom range.

Example 1

  • Focal length: 15.36-43.10
  • F value: 3.60-6.44
  • Half angle of view: 35.76-17.59
  • Total length: 76.36-73.51
  • Back focus: 10.45

Example 2

  • Focal length: 18.45-43.10
  • F value: 4.10-6.44
  • Half angle of view: 31.58-17.59
  • Total length: 80.15-79.38
  • Back focus: 13.47-33.69

Example 3

  • Focal length: 16.23-43.10
  • F value: 3.61-6.44
  • Half angle of view: 32.27-17.59
  • Total length: 88.10-88.68
  • Back focus: 10.87

[via asobinet]

More Canon EOS M10 and EF-M 15-45mm IS STM images leaked (M10 has tiltable screen, lens is retractable)


More images of the upcoming Canon EOS M10 and EF-M 15-45mm IS STM lens have leaked at Digicame Info.

The EOS M10 has a tiltable screen, despite being incredibly small. Could the EOS M10 be the smallest APS-C mirrorless camera in the industry?




The EF-M 15-45mm f/3.5-6.3 IS STM lens has a very compact design, and it is retractable, as we anticipated here on Canon Watch. If you look at the pictures of the lens, you can see the switch to release the lens (same as on the EF-M 11-22mm f/4-5.6 IS STM). You can also see that the 15-45mm IS STM has a plastic mount.

There are very few controls on the M10, so it will be operated mainly through the touch interface. While the EOS M10 is definitely an entry-level MILC, it seems to be an interesting piece of gear. Incredibly small and compact, with a tiltable screen, coming with a new super-compact kit lens. WiFi and NFC also seem to be on board. Not the enthusiast-oriented mirrorless camera we hope to see one day, but still: kudos Canon!

Announcement very soon. Stay tuned…


[via Digicame Info]

Canon EF-M 15-45mm f/3.5-6.3 IS STM and EF 35mm f/1.4L Mark II coming very soon [CW4]


Russian certification authority Novocert has registration document for two Canon lenses: the already rumored EF 35mm f/1.4L Mark II, and a lens for the EOS M system, the EF-M 15-45mm f/3.5-6.3 IS STM. The latter never surfaced in a rumor.

The EF-M 15-45mm f/3.5-6.3 IS STM could be Canon’s next kit lens for the EOS M series cameras. Back in May we had a rumor pointing in this direction, though an 18-55mm IS STM Mark II lens was then mentioned as the new kit lens. However, I would be surprised if the EF-M 15-45mm is not going to be the next EOS M kit lens. Though, an f/6.3 at the telephoto end is a bit disappointing.

The announcement of both lenses should be matter of weeks. In the past, states Digicame Info, the event of a registration at a certification authority usually anticipated the announcement for a few weeks. So, most likely these are the two lenses that will be announced August 14, 2015.

[via Digicame Info via Novocert]