Canon EF 24 mm f/1.4L II USM
7. Coma and astigmatism
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With such a fast and wide lens you can hardly expect the coma being perfectly corrected. The results we saw, after taking into consideration the price and the new construction of the lens, were clearly disgusting, though. At the maximum aperture the coma is still visible even in the APS-C sensor corner. In the full frame corner it is simply monstrous. What’s more, it doesn’t decrease significantly on stopping down by one aperture stop because by f/2.0 it remains still high.
The situation is much better when it comes to astigmatism. Its level was determined by using measuring areas’ pictures, taken with the small sensor camera; it was just symbolic there, not exceeding even 2%. On the full frame it was a bit higher, because its level amounted to 6%, but still it is not a value which will bother us.
