EF24mm f/1.4L II USM

EF24mm f/1.4L II USM

Darkness conquered by the eye of the lens...illumination streaking across the field of vision. This large aperture f/1.4 lens captures subtle nuances of light with exquisite clarity. Featuring the world’s first practical application of SWC anti-reflective coating in a photographic lens, characterized by a structure finer than visible wavelengths of light, this lens successfully keeps flare and ghosting to an absolute minimum, even when light enters the lens at high angles of incidence. Producing superior delineation suited for shooting scenarios from photojournalism and advertising photography to snapshots, the optical array utilizes two molded-glass aspherical and two UD lens elements, which effectively function to suppress distortion and aberrations. The circular aperture creates pleasing out-of-focus effects. With dustproof and waterproof construction and full-time manual mechanical focus, this lens performs to the most demanding professional requirements.


  • EF24mm f/1.4L II USM, Canon EOS-1Ds Mark III, 13sec., f/6.3, ISO100
  • EF24mm f/1.4L II USM, Canon EOS-1Ds Mark III, 3.2sec., f/7.1, ISO100
  • EF24mm f/1.4L II USM, Canon EOS-1Ds Mark III, 1/30sec., f/2.8, ISO400
  • EF24mm f/1.4L II USM, Canon EOS-1Ds Mark III, 0.4sec., f/2, ISO100


Angle of View
(horizontal, vertical, diagonal)
74°/ 53°/ 84°
No. of Diaphragm Blades 8
Closest Focusing Distance 0.25m
Maximum Magnification 0.17x
Water/dust Resistance Yes
Filter Size 77mm
Max. Diameter x Length Ø83.5 × 86.9mm
Weight Approx. 650g
Extension Tube EF12 II 0.67−0.50x
Extension Tube EF25 II No
Lens Cap E-77U / E-77 II
Lens Hood EW-83K
Lens Pouch/Case LP1319

  • UD element
  • GMo aspherical lens
  • SWC

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