Canon EF-S 18-55 mm f/3.5-5.6 II review - Coma and astigmatism

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Canon EF-S 18-55 mm f/3.5-5.6 II

16 October 2007

Arkadiusz Olech

7. Coma and astigmatism

As far as the minimal diaphragm value is concerned, the cheap Canon does not offer us a lot, the section gathering the light isn’t large and the off-axis defects are not very troublesome. Another thing that helps is classifying the lens in the same category as EF-S class lenses. It is a group of lenses designed for the APS-C detector DSLR cameras, and are therefore 2.5 times smaller than the small frame film.

As a result, the coma isn’t large at either the 18 mm or 55 mm focal length, as shown in the pictures of the diode set up in the center and in the upper left corner below.

Canon EF-S 18-55 mm f/3.5-5.6 II - Coma and astigmatism

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The astigmatism situation is a bit more serious. The highest level of that defect (more than a 10% difference between the horizontal and vertical MTF50 values) can be found at the highest focal length range and in the middle of the frame. The best situation is at the 300 mm focal length, and then the differences start at 6%.