Sigma 10-20 mm f/4-5.6 EX DC HSM
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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The Sigma’s 10-20 mm coma is by and large exemplary. At the edge the image the point-like diode looks like a comma (‘coma’ in Latin) and that doesn’t change, no matter what focal length you apply. Still, the level of this aberration seems to be slightly lower than in the case of the Canon although we must honestly admit that the Canon is a faster lens after all.
The astigmatism is corrected in a perfect way and its average level doesn’t exceed 2.4% which we should consider a splendid result.
