Samyang AF 24-70 mm f/2.8 FE review - Distortion

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Samyang AF 24-70 mm f/2.8 FE

2 June 2023

Maciej Latałło

6. Distortion

At first, let's deal with distortion on the smaller APS-C sensor. In case of the 24 mm focal length you have to take into account the presence of slight but noticeable barrel variant, amounting to −2.33%. At 35 mm the deformations become practically zero, with the official result of −0.22%, then distortion changes sign and at 50 mm you deal with pincushion of +0.66% that increases to +0.78% after passing to the maximum focal length.

Sony A7R III, APS-C, 24 mm

Sony A7R III, APS-C, 35 mm

Sony A7R III, APS-C, 50 mm

Sony A7R III, APS-C, 70 mm

In case of full frame there are much more problems. At the 24 mm focal length barrel distortion is perhaps not so very high, amounting to −3.90%, but that result is decreased by moustache deformations. If you limit your measurements to the 1:1 marking area, where you cannot notice any deformations of straight lines caused by moustache distortion, our result increases to −4.61%. It is not a way of dealing with distortion but we must also say that here the Samyang performs much better than the Sigma, which result, averaged out across the frame, reached −4.56%; in the area limited by 1:1 markings it even approached −6.47%.

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Distortion again becomes zero near the 35 mm focal length where we got -0.15%. Then it changes the sign and at 50 and 70 mm you deal with the following results: +1.69% and +1.75% respectively. They are a tad higher than the results of the Sigma for a change as that lens in the same category got +0.94% and +1.32% respectively.