Lens review

Olympus Zuiko Digital 9-18 mm f/4-5.6 ED

7. Coma and astigmatism

Here, we can state practically the same as in the case of distortion – the deformation level of a diode situated in the frame corner is similar to the results, obtained with Tokina 12-24 mm, Nikkor 12-24 mm or Tamron 11-18 mm. Fortunately it’s not high but you can notice a growth with the longer focal length.

Astigmatism correction is again something you can praise the Olympus ZD 9-18 mm for. In its case, an average difference between vertical and horizontal MTF50 values was just 3% which is a brilliant result.