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Lens review

Canon EF 400 mm f/4 DO IS II USM

26 August 2017
Maciej Latałło

7. Coma, astigmatism and bokeh

Thumbnails below show the coma performance of the lens-plus-teleconverter set. Practically every thumbnail looks the same which means the coma correction is splendid, no matter whether you employ the APS-C or the full frame, whether you use the telephoto lens on its own or with the teleconverter attached.

Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh
Center, f/5.6 Corner APS-C, f/5.6 Corner FF, f/5.6
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh


Center, f/5.6 Corner APS-C, f/5.6 Corner FF, f/5.6
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh
Center, f/8.0 Corner APS-C, f/8.0 Corner FF, f/8.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh

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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.6%, a value we deem to be moderate. What’s interesting, after attaching the teleconverter to the lens it didn’t increase, remaining exactly 6.6%.

Defocused circles of light aren’t perhaps perfect but it’s due to the DO technology which can generate a lighter ‘bullet point’ and circular rings. Also the mechanical vignetting makes itself felt a bit.

Center, 400 mm, f/4.0 Corner APS-C, 400 mm, f/4.0 Corner FF, 400 mm, f/4.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO 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 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh
Center, 400 mm, f/8.0 Corner APS-C, 400 mm, f/8.0 Corner FF, 400 mm, f/8.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh

Center, 560 mm, f/5.6 Corner APS-C, 560 mm, f/5.6 Corner FF, 560 mm, f/5.6
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh
Center, 560 mm, f/8.0 Corner APS-C, 560 mm, f/8.0 Corner FF, 560 mm, f/8.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh
Center, 560 mm, f/11.0 Corner APS-C, 560 mm, f/11.0 Corner FF, 560 mm, f/11.0
Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh Canon EF 400 mm f/4 DO IS II USM - Coma, astigmatism and bokeh