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Lens review

Tamron 28-75 mm f/2.8 Di III RXD

26 August 2019
Maciej Lata││o

6. Distortion

On the smaller APS-C sensor distortion shouldn't bother you at all. At the 28 mm focal length it reaches a moderate level of −1.59%, and at 35ámm it decreases to −0.48%. With the increase of the focal length deformations change from barrel into pincushion type. At 50ámm they reach +0.48% and at 75ámm you can observe a further increase – this time to a value of +0.73%.

Noticeably more problems, observed at both ends of the focal range to boot, you get on full frame. At the widest angle of view barrel defomrations reach −2.53%, and at 35ámm they decrease to a value of −0.56%. After the change of the sign distortion increases very quickly - at 50ámm it reaches already +1.45%, and at 75ámm it rises further to +1.83%.

Sony A7R II, APS-C, 28ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, APS-C, 35ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, APS-C, 50ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, APS-C, 75ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion

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Sony A7R II, FF, 28ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, FF, 35ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, FF, 50ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion
Sony A7R II, FF, 75ámm
Tamron 28-75 mm f/2.8 Di III RXD - Distortion