Tamron SP AF 10-24 mm f/3.5-4.5 Di II LD Aspherical (IF)
7. Coma and astigmatism
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As you can see from the clippings below, coma is quite distinct and has a considerable contribution to worsening the image quality at the edge of the frame. The picture of the diode is quite strongly deformed for all focal lengths. Though, you can observe the tendency of decrease of the aberration together with increasing the focal length. Even though competitors like Sigma 10-20 mm, Canon 10-22 mm or Nikkor 12-24 mm didn’t correct coma the best, Tamron 10-24 mm comes out the worst here.
Fortunately, it’s better with astigmatism. Its mean value amounted to 8%, which we find to be a pretty good result.
