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Lens review

Canon EF 100-300 mm f/4.5-5.6 USM

22 September 2007
Robert Olech

7. Coma and astigmatism

In this tested lens the coma was controlled in a very good way, which can be observed in the pictures below. The picture of the diode in the corner of the frame is a bit bigger than in the center but its shape is kept round, which is proof of very good optical work.

Canon EF 100-300 mm f/4.5-5.6 USM - Coma and astigmatism


The astigmatism is corrected well, although not superbly. The average difference between vertical and horizontal MTF50 values in the center reached only 6%. It is worth adding that the astigmatism was smaller in the center of the focal length range and bigger at the edges of that range.

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