Lens review
2010-04-26
Sigma 180 mm f/3.5 EX DG HSM Macro APO
7. Coma and astigmatism
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.
