Canon RF 50mm F1.8 STM Review

January 19, 2021 | Mark Goldstein | Rating star Rating star Rating star Rating star Half rating star

Sharpness at 50mm

Our sharpness tests are carried out by photographing a real-world subject rather than a test chart. The Canon RF 50mm F1.8 STM was attached to a Canon EOS R5 camera, which in turn was mounted on a sturdy tripod. Self-timer mode was activated to steady the camera completely. Any slight tonal changes you may see across the crops are a result of slight changes in natural light during the shooting session.

The full frame

The full frame at 50mm

At the centre of the image, sharpness is very good at the maximum aperture of f/1.8, before rising to excellent at f/2.8.

It maintains that level of sharpness until f/11, where it remains excellent but is ever-so-slightly softer. It gets softer again at f/16, with the softest results seen at f/22 - the narrowest aperture.

At the edges of the image, the sharpest results can be seen between f/4 and f/8.

Aperture Centre Crop Edge Crop
f/1.8 f1.8.jpg f1.8.jpg
f/2 f2.jpg f2.jpg
f/2.8 f2.8.jpg f2.8.jpg
f/4 f4.jpg f4.jpg
f/5.6 f5.6.jpg f5.6.jpg
f/8 f8.jpg f8.jpg
f/11 f11.jpg f11.jpg
f/16 f16.jpg f16.jpg
f/22 f16.jpg f16.jpg