LensTip.com

Lens review

Samyang AF 45 mm f/1.8 FE

12 September 2020
Maciej Latałło

8. Vignetting

First let's check how the lens performs on the smaller APS-C sensor – appropriate thumbnails you can find below.

A7R II, APS-C, f/1.8 A7R II, APS-C, f/2.0
Samyang AF 45 mm f/1.8 FE - Vignetting Samyang AF 45 mm f/1.8 FE - Vignetting


Small dimensions of the lens mean you can notice vignetting already on the smaller sensor. At the maximum relative aperture that aberration reaches 31% (−1.07 EV) and it decreases to 24% (−0.79 EV) on stopping down the aperture to f/2.0. Problems in this category end practically completely by f/2.8 and f/4.0 where we got the following results: 11% (−0.33 EV) and 10% (−0.30 EV) respectively.


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Now let's check the situation on full frame – appropriate thumbnails you can find below.

A7R II, FF, f/1.8 A7R II, FF, f/2.0
Samyang AF 45 mm f/1.8 FE - Vignetting Samyang AF 45 mm f/1.8 FE - Vignetting
A7R II, FF, f/2.8 A7R II, FF, f/4.0
Samyang AF 45 mm f/1.8 FE - Vignetting Samyang AF 45 mm f/1.8 FE - Vignetting


According to our expectations there are far more problems here. At the maximum relative aperture brightness loss in frame corners amounts to as much as 64% (−2.99 EV). You can also spot vignetting without any difficulties by f/2.0 and f/2.8 where we got the following results: 60% (−2.68 EV) and 36% (−1.30 EV). Moderate levels are achieved only from f/4.0 onwards, with light fall-off being 27% (−0.92 EV). By f/5.6 the vignetting decreases to 23% (−0.76 EV) and further stopping down doesn't have any measurable influence on this aberration.

Sony A7R II, JPEG, f/1.8
Samyang AF 45 mm f/1.8 FE - Vignetting