Advice please - Canon 24-70 f2.8L - lens fault?

Started Aug 26, 2017 | Discussions thread
MitchAlsup Veteran Member • Posts: 4,940
Re: Advice please - Canon 24-70 f2.8L - lens fault?

Below is a shot at 70mm f2.8. Looking at the bottom and lower corners of the frame, the image looks smeared, not just out of focus. What would cause this effect?

A) causes:: Field curvature, astigmatism, coma. My personal guess is astigmatism.

B) if you have trouble with the very ends of the corners and ignore the crisp focus  and brilliant colors towards the center, you won't make it very far in photography.

C) I wonder why you did not complain about the curved telephone poles?

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