Tokina ATX-M 11-18 mm f/2.8 E review - Coma, astigmatism and bokeh

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Tokina ATX-M 11-18 mm f/2.8 E

14 December 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

It seems coma is a bit bothersome for the Tokina because diode images in the frame corners turn into a small comma at every focal length. It is a classic symptom of this aberration. Still, they lack side 'wings' that are created by badly corrected aberrations of higher degrees so I suppose in this category there are no serious reasons to complain.

A6400, 11 mm, f/2.8, center	A6400, 11 mm, f/2.8, Corner

A6400, 14 mm, f/2.8, center	A6400, 14 mm, f/2.8, Corner

A6400, 18 mm, f/2.8, center	A6400, 18 mm, f/2.8, Corner

Astigmatism understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.8%, a result on the borderline between low and very low level. It's also worth adding that the aberration is on the same level for every focal length we examined.

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Out-of-focus images provided by the Tokina 11-18 mm won't bowl you over for sure. They feature too many uneven patches connected to onion-ring bokeh and a brighter rim on top of that. Still mechanical vignetting is not especially distinct here, remaining noticeable only and solely at the maximum relative aperture.

A6400, 18 mm, f/2.8, center	A6400, 18 mm, f/2.8, Corner

A6400, 18 mm, f/4.0, center	A6400, 18 mm, f/4.0, Corner

A6400, 18 mm, f/5.6, center	A6400, 18 mm, f/5.6, Corner