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

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

25 May 2011

Arkadiusz Olech

7. Coma and astigmatism

The coma can be felt a bit at 18-30 mm but it becomes negligible at the maximum focal length. At the shorter end we get a performance very similar to that of the predecessor. At 55 mm the new lens seems to fare a bit better.

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

In the case of the cheapest, low-end constructions with poor quality casing the astigmatism is often not the measure of the optics build quality but the casing build quality of a given specimen. That off-axis aberration is very sensitive to any improper slopes of the optical elements toward the axis and in the most shabbily build instruments these are very frequent after all.

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In the case of the tested lens’s predecessor the astigmatism was well-corrected and it amounted just 6%. A bit worse performance of the specimen, tested here, can stem from the fact that the astigmatism reaches a noticeably higher level of 11%.