RF Lenses


RF50mm F1.8 STM

  • Specifications
  • Block diagram
Marketed December 2020
Original Price Open price
Lens Construction (group) 5
Lens Construction (element) 6
No. of Diaphragm Blades 7
Minimum Aperture 22
Closest Focusing Distance (m) 0.30
Maximum Magnifcation (x) 0.25
Filter Diameter (mm) 43
Maximum Diameter x Length (mm) Approx. 69.2×40.5
Weight (g) Approx. 160

With standard 50 mm angle of view, which is comparable to that of the human eye, the new lens enables users to frame shots in a natural way that makes it ideal for such photography scenarios as portraits, everyday shots and landscapes. The RF50mm F1.8 STM offers a fast f/1.8 maximum aperture utilizing 7 blades, making possible expression with impressive circular background blur. What’s more, the lens offers a minimum focusing distance of 0.3 m and a maximum magnification1 of 0.25x, allowing users to get even closer to subjects such as food and small items and capture photos with pleasant background blur.

The RF50mm F1.8 STM features an enhanced version of the highly praised optical configuration employed by the EF 50mm f/1.8 STM by leveraging the wide internal mount diameter and a short back focus2 of the RF mount to realize an optical design that incorporates 6 elements in 5 groups. In addition, optimal placement of an aspherical lens element makes possible a compact and lightweight design measuring approximately 40.5 mm in length and weighing approximately 160 g. Along with a highly portable design, the lens delivers high image quality, even when shooting at maximum aperture.

The lens features a focus/control ring that can adjust the focal point and also be customized to adjust such settings as shutter speed and aperture value. This enables users to configure intuitive and comfortable operation based on the current shooting scenario. In addition the focus/control ring sports a fine diamond-shape pattern that lends a touch of elegance to the lens design.

1 Magnification refers to the ratio between the size of the subject and its size when reproduced on a camera’s image sensor. A magnification ratio of 1.0x (1:1) means that a subject can be reproduced at its actual size on the camera’s image sensor.
2 A short distance between the optical axis from the vertex of the rear lens element to the imaging plane when focused to infinity.

Block diagram

Aspherical lens