Sigma 180 mm f/3.5 EX DG HSM Macro APO
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 influence of the coma on the image quality at frame edge is noticeable but its value isn’t high. It would be difficult to have any serious reservations in this category.
A similar situation we see in the case of the astigmatism. The average difference between vertical and horizontal MTF50 function values amounted in this case to 6%. It brushed against the level of 5% and less, which we consider to be excellent.
