Lens
Focal Length 1200mm
Maximum and Minimum Aperture f/8 - f/64
Lens Mount Type RF Mount, metal
Compatible Cameras Canon EOS R-series
Minimum Focusing Distance 4.3 m / 14.1 ft.
Maximum Magnification 0.29x
Field of View, at Minimum Focus Distance Approx. 241 mm × 161 mm / 9.5 x 6.3 in.
Angle of View (Diagonal) 02° 05’
RF Extender Compatibility
Canon RF Extender 1.4x/2x Compatible
Equivalent Focal Length / Maximum
Aperture
RF1.4x — 1680mm f/11
RF2x — 2400mm f/16
Maximum close-focusing magnification
RF1.4x — 0.41x
RF2x — 0.60x
Autofocus with EOS R-series cameras*
* (as of 2/2022)
Possible with either extender
Image Stabilizer with EOS R-series
cameras*
* (as of 2/2022)
Possible with either extender
Optical Design
Lens Construction 26 elements in 18 groups
Special Elements (2) Fluorite, (1) Super UD Lenses, (1) UD (Ultra-low Dispersion)
Lens Coating Super Spectra Coating, Fluorine Coating, ASC
Filter Size Diameter ø52 mm
Aperture Blades 9, circular shape
Image Stabilization 4 stops correction with In-lens Optical Image Stabilization
Focusing
Focusing Drive System Canon USM low-speed drive (Ring USM)
Full-time Manual Focusing
Yes
(Supports both ONE SHOT AF and SERVO AF with compatible EOS R-series
cameras)
Manual Focus Speed Selection
Yes (1, 2, and 3 settings, via switch on lens)
• 1= fastest MF; 3= slowest MF rotation
Specifications
RF1200mm F8 L IS USM
Focus Distance Range Selection
Yes (3 positions, via switch on lens)
• FULL — 4.3m/14.1 feet – infinity
• 4.3m/14.1 feet – 30m/98.4 feet
• 30m/98.4 feet – infinity
Dual Pixel CMOS AF Coverage
(Horizontal x Vertical)
EOS R5/R6 — approx. 100% x 100%
EOS R — approx. 88% x 100%
With Extender RF1.4x
EOS R5/R6 — approx. 80% x 80%
EOS R — approx. 80% x 80%
With Extender RF2x
EOS R5/R6 — approx. 40% x 60%
EOS R — approx. 40% x 60%
Power Focus
Yes, via rotation of Playback Ring
• Lens Focus Preset switch set to OFF; Focus Mode switch set to “PF”
• Two focus speeds, based on ring rotation angle
Image Stabilization
IS On–Off Image Stabilizer switch, on lens barrel
Optical Image Stabilization
Provided
• 4 stops correction (CIPA standard) with both EOS R and R5
IS Mode Selection
IS Modes 1, 2 and 3 (via switch on lens barrel)
• Mode 1 — general shake correction
• Mode 2 — correction during panning
• Mode 3 — correction only during exposure
Panning Mode Support (SCN Mode) Supported
Exterior Design
Control Ring Dual-function Manual focus ring / Control Ring (selected using camera menu)
Manual Focus Ring
Electronic ring system
• Full-time Manual focus possible
• No physical limit to ring rotational angle
AF/MF Switch YES - AF/PF/MF Switch
MF/Control Ring Switch None — must be selected in camera menu
Distance Scale
None
• Distance scale available in EVF or Live View LCD screen of compatible
EOS R-series cameras
Distance Limiter Switch FULL (2.6 m to infinity) / 2.6 m to 20 m / 20 m to infinity
Focus Pre-set Function
Yes, via Playback Ring on lens barrel
• Off – On – On with beep tone, via lens switch
• Distance memorized via Focus Preset button
• Two distances can be memorized; immediate return to either via direction of
Playback Ring
Lens Function Buttons (AF-Stop Buttons) Yes; four positioned on lens barrel
Dust / Weather Resistant Construction YES - rubber ring on lens mount
Dimensions, Weight
Maximum Outer Diameter x Length Approx. ø6.6 in. x 21.1 in. (ø168.0mm x 537mm)
Weight Approx. 117.8 oz. / 7.4 lb. / 3340g
Accessories
Lens Hood
Canon Lens Hood (long) ET-160 (Bundled)
Canon Lens Hood (short) ET-160B (Sold Separately)
Lens Cap Canon E-185C (Bundled)
Dust Cap Canon Lens Dust Cap RF (Bundled)
Lens Case Canon Lens Soft Case LS1200 (Bundled)
Extension Tubes None (No Canon RF mount extension tubes)
Close-up Lenses 250D / 500D Not compatible
Drop-in Filters
Compatible - 52mm Drop-in Filter Holder 52 (WIII) Included
• Accepts 52mm screw-in filters
• Canon 52mm clear Protect Filter included