EF600mm f/4L IS III USM

EF600mm f/4L IS III USM

For shots so close, you’ll almost hear the breath of the wild animal. The EF600mm f/4L IS III USM renews its optical system while maintaining high image quality and robustness, in a large-aperture f/4 super telephoto lens that cuts the weight compared to its predecessor by a significant 870g. Its special ASC (Air Sphere Coating) suppresses flaring and ghosting to take image quality even higher. Featuring an image stabilization effect the equivalent of shutter speeds five stops* faster, a new manual focus speed switch, a minimum shooting distance of 4.2m, and a heat shield coating, the EF600mm f/4L IS III USM surpasses existing super telephoto lenses in ease of operation and expressive power.

  • *When EOS-1D X Mark II is used. Conforms to CIPA standards.


  • EF600mm f/4L IS III USM, Canon EOS R, 1/640sec., f/4, ISO200
  • EF600mm f/4L IS III USM, Canon EOS R, 1/800sec., f/5.6, ISO100
  • EF600mm f/4L IS III USM, Canon EOS-1D X Mark II, 1/800sec., f/6.3, ISO200
  • EF600mm f/4L IS III USM, Canon EOS-1D X Mark II, 1/1600sec., f/4, ISO3200


Angle of View
(horizontal, vertical, diagonal)
3°30’/ 2°20’/ 4°10’
No. of Diaphragm Blades 9
Closest Focusing Distance 4.2m
Maximum Magnification 0.15x
Water/dust Resistance Yes
Filter Size Drop-in52mm
Max. Diameter x Length Ø168 × 448mm
Weight Approx. 3,050g
Extension Tube EF12 II 0.18−0.02x
Extension Tube EF25 II 0.21−0.05x
Lens Cap E-185C
Lens Hood ET-160 (WIII)
Lens Pouch/Case Lens Soft Case LS600

  • Fluorite element
  • Super UD element
  • ASC
  • Fluorine Coating

MTF Characteristics

Spatial frequency Maximum aperture
10 lines/mm
30 lines/mm
How to read
MTF characteristics

Spatial frequency Maximum aperture
10 lines/mm
30 lines/mm

The more the S and M curves are in line, the more natural the blurred image becomes.

Modulation Transfer Function, or MTF, is a method of evaluating lens performance using contrast reproduction ratio. When evaluating the electrical characteristics of audio equipment, one important measure of performance is frequency response. This indicates the fidelity of the reproduced sound with respect to the source sound as it passes through the microphone, recording and playback circuits, and finally the speakers. When the reproduction is accurate, the equipment is classified as “hi-fi,” or “high fidelity.”
In the same way, when a lens is viewed as a transmission system for optical signals, measuring the frequency response of the optical system reveals whether the optical signal is transmitted faithfully. For a lens, the equivalent of frequency is “spatial frequency,” which indicates how many patterns, or cycles, of changes in sinusoidal density are present in a 1 mm width. Accordingly, the unit of spatial frequency is lines per mm, as opposed to Hz in electrical systems.

The MTF characteristics shown on this website are 10 lines/mm and 30 lines/mm, where the horizontal axis indicates image height (the distance on a diagonal line from the center of the image, in mm) with the image center set to 0, and the vertical axis indicates contrast. The closer the 10-line/mm curve is to 1, the better the contrast and clarity of the lens; the closer the 30-line/mm curve is to 1, the better the resolving power and sharpness of the lens. Although a good balance between both of these is important for a lens to be sharp and clear, a lens is generally said to offer excellent image quality if the 10-line/mm curve is greater than 0.8, or satisfactory image quality if greater than 0.6.

Resolving power and contrast are both good

Contrast is good; resolving power is poor

Resolving power is good; contrast is poor