Canon EF 70-200 mm f/4L USM
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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
As far as coma is concerned the behavior is similar to the chromatic aberration. At 135-200 mm coma is almost invisible. At 70 mm it increases a bit, which could cause poorer picture resolution.
The astigmatism is very well controlled. We measured its level of 5.7% and the astigmatism was the largest at 70 mm, medium at 200 mm and the smallest at 135 mm focal length.
