Nikon Nikkor AF-S DX 18-200 mm f/3.5-5.6G IF-ED VR review - Coma and Astigmatism

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Nikon Nikkor AF-S DX 18-200 mm f/3.5-5.6G IF-ED VR

25 September 2007

Arkadiusz Olech

7. Coma and Astigmatism

Unfortunately, coma does effect our tested Nikkor. It is clearly visible at 18 mm and its maximum value can even be noticed, surprisingly, at 50 mm. After that it stars decreasing to reach its minimum value at 100 mm, and then increases again at 200 mm, when it is visible again, although not so significantly as at 18 and 50 mm.

Nikon Nikkor AF-S DX 18-200 mm f/3.5-5.6G IF-ED VR - Coma and Astigmatism

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Nikkor's good results in this category are a result of its good astigmatism correction. The average difference between the horizontal and parallel MTF50 values measured 15-20% away from the center of the frame are only 4.6%. This result is considered very good, especially with Nikkor's complicated construction.