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Pros Pros
  • Wide f/2.8 aperture with smooth background blur
  • Exceptional image sharpness and contrast
  • Fast and accurate autofocus performance
  • Durable build quality with teleconverter compatibility
  • Effective optical image stabilization
Cons Cons
  • Very high financial cost
  • Large and heavy physical design
  • Lacks a customizable control ring
  • Missing integrated Arca Swiss mount and front filter support
  • Limited functional improvements over the previous EF version

Launch price Launch price $11,999
Focal length & aperture Focal length & aperture 400mm f/2.8
Mount & coverage Mount & coverage Canon RF · Full-Frame
Stabilization Stabilization Optical IS, 5.5 stops (CIPA)
Close focus Close focus (0.17x)
Filter thread Filter thread 52mm
Autofocus motor Autofocus motor Ring-type ultrasonic
Weight & size Weight & size 2890g (6 lb 5.9 oz) · 163 x 367 mm (6.42 x 14.45 in)

Announcement date Announcement date April 14, 2021
Launch MSRP Launch MSRP $11,999
Lens mount Lens mount Canon RF
Image circle coverage Image circle coverage Full-Frame

Elements Elements 17
Groups Groups 13
Front fluorine coating Front fluorine coating Yes

Focal length (wide) Focal length (wide) 400mm
Focal length (tele) Focal length (tele) 400mm
Max aperture Max aperture f/2.8
Minimum aperture Minimum aperture f/32
Diaphragm blades Diaphragm blades 9

Diagonal angle of view Diagonal angle of view 6°

Autofocus motor Autofocus motor Ring-type ultrasonic
Maximum magnification Maximum magnification 0.17x
Focus mechanism Focus mechanism Internal focus

Optical stabilization (OIS) Optical stabilization (OIS) Yes
OIS rating OIS rating 5.5 stops

AF/MF switch AF/MF switch Yes

Weight Weight 2890g (6 lb 5.9 oz)
Maximum diameter Maximum diameter 163mm (6.42 in)
Length Length 367mm (14.45 in)
Filter thread Filter thread 52mm
Weather sealing Weather sealing None
Tripod collar Tripod collar Included

Lens hood Lens hood ET-155 (WIII), included