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Canon EF 400 mm f/4 DO IS II USM

26 August 2017
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Arkadiusz Olech

6. Distortion

Fixed focal length telephoto lenses usually don’t have any noticeable distortion problems. The Canon EF 400 mm f/4 DO IS II USM is not an exception to that rule. On the smaller APS-C sensor its distortion level reaches just +0.17% so is, within the margin of error, practically zero. After passing to full frame it increases to +0.34%, a value we still deem negligible.

When you attach the 1.4x teleconverter the distortion value changes its sign, so it becomes of the barrel variety. On the smaller sensor it remains practically imperceptible, amounting to −0.22%. After passing to full frame its value increases to −0.69% but we still consider that level low.

Canon 80D, 400 mm
Canon EF 400 mm f/4 DO IS II USM - Distortion
Canon 5D MkIII, 400 mm
Canon EF 400 mm f/4 DO IS II USM - Distortion


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Canon 80D, 560 mm (TC)
Canon EF 400 mm f/4 DO IS II USM - Distortion
Canon 5D MkIII, 560 mm (TC)
Canon EF 400 mm f/4 DO IS II USM - Distortion



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