Conclusion

The Canon EF-S 24mm f/2.8 STM is a tiny prime lens that delivers surprisingly good image quality given its inexpensive price-point, making it a great moderate wide-angle addition to a compact, lightweight EOS kit.

With its mostly plastic construction, with the exception of the metal lens mount, the Canon EF-S 24mm f/2.8 STM isn't going to withstand too many knocks and scrapes, but it is extremely light and therefore a good partner for smaller EOS bodies. Auto-focusing is surprisingly quick, and for video shooters the micro-STM motor is appealingly smooth and almost completely quiet. The ability to instantly manually override the AF system via the focus ring if required is a nice touch, although it is rather too narrow for our liking.

Image quality is very good. Centre sharpness is excellent even at the maximum aperture, and almost as impressive at the edges of the frame. Chromatic aberrations are fairly well controlled, although there's obvious vignetting at the maximum aperture and some barrel distortion too. The lens doesn't ship with a hood, although it didn't really exhibit any unwanted flare effects.

In summary, we can strongly recommend the Canon EF-S 24mm f/2.8 STM as an extremely small and lightweight prime lens for APS-C DSLR owners that won't break the bank.

Ratings (out of 5)
Design	4.5
Features	4
Ease-of-use	4
Image quality	4.5
Value for money	5