Canon Patent: RF 70mm F1.8 STM Lens For EOS R System

canon patent

A new Thursday, a new Canon patent. Not surprising yet another one for the RF mount. The whole thing was spotted by asobinet.com.

Canon patent application 2021-131499 (Japan) discusses optical formulas for what appears to be an RF 70mm f/1.8 STM lens for Canon’s full frame mirrorless system EOS R. From the patent literature:

PROBLEM TO BE SOLVED

To provide a compact, lightweight and large-diameter optical system.

Patent Document 1 describes a double-Gauss type optical system capable of correcting various aberrations with a small number of lenses

However, the double-Gauss type optical system as disclosed in Patent Document 1 satisfactorily corrects various aberrations such as spherical aberration and curvature of field when the symmetry is broken due to miniaturization. Becomes difficult. In particular, when the optical system has a large aperture ratio, it becomes difficult to suppress sagittal flare and coma flare at an intermediate angle of view.

Therefore, an object of the present invention is to provide an optical system and an image pickup apparatus having high optical performance while being compact and having a large aperture ratio.

Embodiment 1:

  • Focal length 49.57
  • F number 1.85
  • Half angle of view 23.58
  • Image height 21.64
  • Lens overall length 59.59
  • BF 25.67

Embodiment 2:

  • Focal length 70.00
  • F number 1.85
  • Half angle of view 17.17
  • Image height 21.64
  • Lens overall length 83.52
  • BF 36.62

According to asobinet, the lens discussed in the patent literature has an optical design similar to the RF 50mm F1.8 STM. Maybe it is another excellent performer at an affordable price.

More Canon patents are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Takes Over Canadian Chipmaker Redlen For $270M

eos r with aps-c

As you fine and well-informed folks surely know, there is a chip shortage going on. Blame the pandemic, as usual.

Nikkei Asia reports that Canon is about to acquire the Canadian chip maker Redlen. For $270M. It’s not much about cameras but for computer tomography (CT( scanners.

Canon is developing CT scanners that reduce radiation exposure to one-tenth by leveraging Redlen technology that efficiently detects X-rays.

Redlen Technologies, created in 1999, currently employs around 200 workers. It does not disclose its annual sales. Canon has a 15% stake in the Canadian company and appears to have agreed with other shareholders to buy the remaining 85%.

The acquisition is expected to be completed this fall.

Canon would be able to make the needed chips on their own.

What’s “Born To Rule” And Coming September 14, 2021?

Canon EOS R3

No kidding: the Canon EOS R3 is going to get announced next week, on September 14, 2021. Canon’s propaganda machine is already starting the engines and preparing for the launch.

Canon Singapore no less claims that something “born to rule” is coming on 9/14/21. We have no doubt the EOS R3 will be the one MILC to rule them all.

Calling all passionate about photography! Get ready for some exciting news as we prepare to unveil the newest and hottest products from Canon at our virtual launch.

While waiting for the one and only one that’s born to rule, have a look at how impressing the 30fps of the R3 are. Here is what we know about the EOS R3 so far:

  • 24MP backside illuminated image sensor
  • Multi-Controller & Smart Controller
  • Vari-Angle Touch Screen
  • NEW accessory shoe
  • Wifi 5GHz
  • High speed 30fps electronic shutter with AF/AE tracking + RAW shooting at this speed
  • AF down to -7.0 EV
  • 8 Stops Coordinated Control IS with Optical IS and In-Body IS
  • 4K Canon Log3​
  • Oversampling 4K
  • Internal RAW video
  • Inclusion of cars and motorbikes in AF tracking technology
  • RAW internal movie recording
  • Speedlite shooting with electronic shutter
  • The same weather sealing as the EOS-1D series
  • LP-E19 Battery
  • Dual card slot SD & CFExpress

All our EOS R3 coverage is listed here, product images are here and here. There has been some discussion about who makes the imaging sensor of the EOS R3. You can get notified when the Canon EOS R3 will be available for preorder.

canon eos r3
The upcoming Canon EOS R3