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Lens review

Samyang 24 mm f/1.4 ED AS UMC

10 February 2012
Szymon Starczewski

8. Vignetting

The vignetting of the Samyang 1.4/24 on the smaller sensor of the Canon 50D is moderate – it can be seen in the thumbnails below.

Samyang 24 mm f/1.4 ED AS UMC - Vignetting


Our measurements confirm it. At the maximum relative aperture the vignetting is 32% (-1.13 EV) and its level is noticeable although not especially high. On passing to f/2.0 we see this aberration decrease to the level of 27% (-0.92 EV). The problems disappear almost completely by f/2.8 and f/4.0 where we got respectively 15% and 10%.

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A chart below shows how the Samyang fares compared to its rivals.


Nikkor
1.4/24G
Canon
1.4/24L II
Samyang
1.4/24
f/1.4
29%
34%
32%
f/2.0
12%
17%
27%
f/2.8
7%
9%
15%


It’s very difficult to have low vignetting at the combination of f/1.4 aperture and a wide angle at 24 mm focal length on full frame. The Canon EF 24 mm f/1.4L II USM was the proof of it and the lesson was rather painful as that lens broke some notorious records in this category. How does the Samyang fare here? In order to assess it just look at thumbnails below.

Samyang 24 mm f/1.4 ED AS UMC - Vignetting


At the maximum relative aperture the vignetting gets to as much as 65% (-3.05 EV) – really huge. On passing to f/2.0 the improvement is rather symbolic because the brightness loss is still 63% (-2.85 EV) which is significantly higher than in the case of competitors. A sharp decrease of vignetting can be seen only when you pass from f/2.0 to f/2.8 where that aberration amounts to 46% (-1.78 EV). Applying the f/4.0 aperture reduces the vignetting to still bothersome value of 31% (-1.07 EV). A bit better situation is by f/5.6 where that aberration is 23% (-0.75 EV). The problem stops being bothersome only by f/8.0 where the light fall-off in the corners reaches 18% (-0.56 EV) On further stopping down you don’t see any measurable decrease of vignetting.

A chart, presented below, shows a comparison of the result of the Samyang to those of its direct rivals.


Nikkor
1.4/24G
Canon
1.4/24L II
Samyang
1.4/24
f/1.4
54%
78%
65%
f/2.0
38%
62%
63%
f/2.8
25%
43%
46%
f/2.8
19%
37%
31%


Samyang 24 mm f/1.4 ED AS UMC - Vignetting