RF24-105mm F4 L IS USM

RF24-105mm F4 L IS USM

The RF24-105mm F4 L IS USM is a standard zoom lens that crosses the boundaries of still images and video to expand the range of expressiveness in imaging. Its flexible optical design takes advantage of the large diameter and short back focus made possible by the RF mount to open up new possibilities in lenses. With its effective arrangement of three glass-molded aspherical elements and a UD element for outstanding imaging performance, the design achieves a compact total length of 107.3mm and light weight of 700g. It is the first L lens to incorporate the Nano USM, pursuing fast AF for still images and comfortable video shooting. It further features an image stabilizing mechanism that counteracts camera shake in handheld shooting by the equivalent of five stops.* Its control ring, which can be assigned to aperture, shutter speed, ISO sensitivity settings, and exposure compensation, supports intuitive shooting.

  • *When EOS R is used with a focal length of 105mm. Conforms to CIPA standards.


  • RF24-105mm F4 L IS USM, Canon EOS R, 1/160sec., f/4.5, ISO200
  • RF24-105mm F4 L IS USM, Canon EOS R, 1/400sec., f/8, ISO100
  • RF24-105mm F4 L IS USM, Canon EOS R, 1/640sec., f/10, ISO200
  • RF24-105mm F4 L IS USM, Canon EOS R, 6sec., f/8, ISO100


Angle of View
(horizontal, vertical, diagonal)
74°−19°20’/ 53°−13°/ 84°−23°20’
No. of Diaphragm Blades 9
Closest Focusing Distance 0.45m
Maximum Magnification 0.24x (at 105mm)
Water/dust Resistance Yes
Filter Size 77mm
Max. Diameter x Length Ø83.5 × 107.3mm
Weight Approx. 700g
Lens Cap E-77 II
Lens Hood EW-83N
Lens Pouch/Case LP1319

  • UD element
  • GMo aspherical lens
  • 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