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Lens review

Canon EF 100-400 mm f/4.5-5.6L IS II USM

24 June 2015
Szymon Starczewski

7. Coma, astigmatism and bokeh

The users of the Canon EF 100–400 mm f/4.5–5.6L IS II USM might not be aware that such an off-axis aberration as coma exists at all because the lens won’t give them any chance to notice it. Even in the corners of full frame the image of a diode remains symmetrical and there are no deformations whatsoever.

Center, 100 mm, f/4.5 Corner APS-C, 100 mm, f/4.5 Corner FF, 100 mm, f/4.5
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh
Center, 200 mm, f/5.0 Corner APS-C, 200 mm, f/5.0 Corner FF, 200 mm, f/5.0
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh
Center, 300 mm, f/5.0 Corner APS-C, 300 mm, f/5.0 Corner FF, 300 mm, f/5.0
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh
Center, 400 mm, f/5.6 Corner APS-C, 400 mm, f/5.6 Corner FF, 400 mm, f/5.6
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh


When it comes to the astigmatism its correction is a bit worse than that of coma. The average difference between horizontal and vertical MTF50 function values amounted to 6.6% but it is not a result you should worry about. Still it must be mentioned that the 200 mm focal length contributed the most to that value as it was the worst– in its case the astigmatism reached 11.2%. The shortest focal length had a truly sensational result of just 1.8% for a change.

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For a zoom lens the defocused circles of light look very well. The light spread is very even; the one thing you can have reservations about is a light rim which intensity increases with the stopping down.

Center, 300 mm, f/5.0 Corner APS-C, 300 mm, f/5.0 Corner FF, 300 mm, f/5.0
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh
Center, 300 mm, f/7.1 Corner APS-C, 300 mm, f/7.1 Corner FF, 300 mm, f/7.1
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh
Center, 300 mm, f/10.0 Corner APS-C, 300 mm, f/10.0 Corner FF, 300 mm, f/10.0
Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh Canon EF 100-400 mm f/4.5-5.6L IS II USM - Coma, astigmatism and bokeh