LensTip.com

Lens review

Canon EF-S 24 mm f/2.8 STM

6 May 2015
Arkadiusz Olech

4. Image resolution

The resolution test of the Canon EF-S 24 mm f/2.8 STM was based on RAW files from the Canon EOS 50D. Maximum MTF values, reached by the best lenses on that body, go as high as 52-55 lpmm. The decency level is situated near 34-35 lpmm.

Now let’s check how the tested lens compares – a graph for the frame centre and the edge of the APS-C sensor is presented below.

Canon EF-S 24 mm f/2.8 STM  - Image resolution


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The performance in the frame centre makes you want to clap and cheer. Already at the maximum relative aperture the results exceed a very high level of 50 lpmm and on stopping down the lens to f/4.0 they get near 52 lpmm. Such a performance is really worth the best system “primes”.

The lens fares worse on the edge of the frame but when it comes to a “pancake” device you shouldn’t really expect anything else. Still it must be noticed that only at the maximum relative aperture you land on the borderline of the decency level; a slight stopping down is able to improve the performance.

To sum up the unassuming Canon EF-S 24 mm f/2.8 STM was able to surprise us very nicely, faring better than we expected – a round of applause!

At the end of this chapter traditionally we present crops taken from photos of our resolution testing chart saved as JPEG files along with RAW files, used for the analysis above.

Canon 50D, JPEG, f/2.8
Canon EF-S 24 mm f/2.8 STM  - Image resolution
Canon 50D, JPEG, f/4.0
Canon EF-S 24 mm f/2.8 STM  - Image resolution