Nikon Nikkor AF-S DX 55-200 mm f/4-5.6G IF-ED VR review - Coma and astigmatism

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Nikon Nikkor AF-S DX 55-200 mm f/4-5.6G IF-ED VR

6 November 2009

Arkadiusz Olech

7. Coma and astigmatism

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The influence of coma on the circular picture of the diode is the most visible at 55 mm. The effect is not huge, though. The situation improves significantly at 125 and 200 mm so our assessment in this category is positive.

Nikon Nikkor AF-S DX 55-200 mm f/4-5.6G IF-ED VR - Coma and astigmatism

When it comes to astigmatism we also can’t complain here – the average difference between vertical and horizontal MTF50 function values amounts to less than 6% which is considered to be a low level. The problem is that in lenses which barrels are made mostly of plastics the astigmatism likes breaking out after some time, when elements start to position themselves at the wrong angle to the optical axis of the instrument due to wear and tear of less durable components. Will it also be true in the case of the Nikkor? It’s really difficult to say now – only our Readers can inform us about it in their opinions under the test and in our base. Of course, we would like to encourage them to do so.