Canon EF 24mm f/1.4 USM L - Review / Test Report - Analysis
Lens Reviews - Canon EOS (APS-C)

Distortion

The lens shows slight but still visible barrel distortion.

The chart above has a real-world size of about 120x80cm.

Vignetting

On an APS-C DSLR the EF 24mm f/1.4 USM L enjoys a sweet spot effect here. However, this doesn't seem to be enough to produce low vignetting at max. aperture. Admittedly f/1.4 is a rather extreme setting specifically for a wide-angle lens but the vignetting shouldn't really exceed 1EV on an APS-C camera. At f/2 the problem is already reduced to a very acceptable degree and from f/2.8 the issue is negligible.

MTF (resolution)

The EF 24mm f/1.4 USM L showed two different souls in the lab. The center performance of the lens already good to very good at f/1.4 increasing to superb resolution figures from f/2.8 onwards where it easily reaches and probably exceeds the resolution limits of an 8mp sensor. Unfortunately the borders aren't quite as good. At f/1.4 they are soft and it requires f/4 to reach very good territory which is relatively "late". The border quality peaks at f/8. The resolution characteristic at the borders is slightly disappointing for a fix-focal lens with this price tag.

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

Chromatic Aberrations (CAs)

CAs (visible as color shadows at harsh contrast transitions) can reach an average CA pixel width of around 1 pixels at the image borders - an acceptable performance for a wide angle lens but again a little disappointing for this specific lens.




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