Canon EF 85 mm f/1.4L IS USM review - Vignetting

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Canon EF 85 mm f/1.4L IS USM

17 March 2018

Arkadiusz Olech

8. Vignetting

First let’s check how the Canon 1.4/85 performs on the small sensor of the Canon 50D. Appropriate thumbnails we present below.

Canon 50D, f/1.4	Canon 50D, f/2.0

There are no reasons to worry. At the maximum relative aperture the vignetting amounts to 25% (−0.85 EV), and by f/2.0 it decreases to 10% (−0.29 EV). By f/2.8 that aberration becomes completely imperceptible reaching only 6% (−0.17 EV).

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Now let’s see how the situation changes after passing to full frame.

Canon 5Ds, f/1.4	Canon 5Ds, f/2.0

Canon 5Ds, f/2.8	Canon 5Ds, f/4.0

Here the vignetting is much easier to observe. At the maximum relative aperture it reaches 54% (−2.24 EV) – a value higher than 49% of brightness loss featured by the Sigma but also noticeably lower than the shameful 66% presented by the Milvus. Also by f/2.0 you won’t have any problem with noticing vignetting as it gets to 33% (−1.16 EV) at that point. A moderate level is obtained by f/2.8 where we got a result of 14% (−0.45 EV). The problem disappears practically completely by f/4.0 where the light fall-off is just 9% (−0.26 EV).

Canon 5Ds, JPEG, f/1.4