Tag: Canon RF 400mm f/4 DO IS Extender 1.4x

New Canon Patents for RF 600mm f/4 and RF 400mm f/2.8 Super-Telephoto Lenses

Here are the new Canon Patents for RF 600mm f/4 and RF 400mm f/2.8 Super-Telephoto Lenses. Canon patent application 2022-22771 discusses optical formulas for RF mount mirrorless cameras.

See previous patent reports for ,  lenses.

[Publication number] P2022052220
[Publication date] APRIL 4, 2022
[Patent application title] Optical system and imaging device and imaging system

Example 1 (600mm F4)
Focal length of XY cross section 575.00
Focal length of X-Z cross section 575.00
F number 4.10
Half angle of view (°) 2.15 Semi image
height 21.64
Back focus 88.87

Example 2 (400 mm F2.8)
Focal length of XY cross section 399.58 Focal length of
X-Z cross section 399.58
F number 2.90
Half angle of view (°) 3.10 Half image
height 21.64
Back focus 50.30

New Canon Super Telephoto DO Lenses and EOS R1 Coming in 2022

According to recent Canon rumors, new Canon super telephoto DO lenses will arrive along with the rumored EOS R1 flagship camera.

It is expected that Canon will announce (or development announcement) the long rumored EOS R1 flagship camera and a DO super telephoto lens in 2022. The Canon EOS R1 is already in the list of Upcoming Canon Cameras 2022.

In addition, Canon is currently testing 5 DO super telephoto lenses, but only one lens will enter final mass production. From the current actual test, the RF 500mm F4.5 DO IS USM performs well.

5 DO Super Telephoto Lenses:

  • RF 400mm f/3.5 DO IS USM
  • RF 400mm f/4 DO IS USM
  • RF 500mm f/4.5 DO IS USM
  • RF 500mm f/5 DO IS USM
  • RF 800mm f/9.5 DO IS USM

Via: CR

Canon Patent for 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender

Canon filed a new patent for 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender. Canon patent application 2022-22771 discusses optical formulas for RF mount mirrorless cameras. First of all the lenses ;

  • 400mm f/4 DO IS Extender 1.4x
  • 600mm f/4 IS Extender 1.4x

See the details of the 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender below. Continue reading “Canon Patent for 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender”