Olympus Zuiko Digital 9-18 mm f/4-5.6 ED
7. Coma and astigmatism
Please Support UsIf you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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.
