Canon EF 28mm f/2.8 IS USM Lens Review

Canon EF 28mm f/2.8 IS USM Performance

The performance of this lens is quite amazing with regards to sharpness. Sharpness is outstanding across the frame from maximum aperture right down to f/11. This kind of performance is about as close to perfect as you can get.

How to read our charts The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Averaging them out gives the red weighted column. The scale on the left side is an indication of actual image resolution. The taller the column, the better the lens performance. Simple. For this review, the lens was tested on a Canon EOS 5D MkII using Imatest.

Chromatic aberrations are well controlled, only just exceeding half a pixel width towards the edges of the frame at most apertures. This low level of fringing should pose few issues, even in large prints, or harsh crops from the edges of the frame.

How to read our charts Chromatic aberration is the lens' inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software. Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more. For this review, the lens was tested on a Canon EOS 5D MkII using Imatest.

Falloff of illumination towards the corners of the frame is very noticeable at maximum aperture. At f/2.8 the corners are 3.6 stops darker than the image centre and visually uniform illumination is achieved until the aperture is stopped down to f/8 or beyond.

Only a mild level of 1.06% barrel distortion is present and the distortion pattern is uniform across the frame, which should make it relatively straightforward to correct in image editing software afterwards.
No lens hood is supplied as standard by Canon, which is a shame. Luckily this lens doesn't suffer any severe issues with flare, even with bright sources of light in the frame. Contrast remains high when shooting into the light also. If you require the optional lens hood the EW-65B will set you back a wallet-lightening £47.

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