Nikon Nikkor AF-S DX 18-140 mm f/3.5-5.6G ED VR review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S DX 18-140 mm f/3.5-5.6G ED VR

15 April 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

Coma makes itself felt noticeably only at the wide angle. At 35 mm focal length it becomes already moderate and nearer the longer end – slight. It is a very similar performance to that you could observe in the test of the Nikkor 18-105 mm VR.

Nikon Nikkor AF-S DX 18-140 mm f/3.5-5.6G ED VR - Coma, astigmatism and bokeh

The astigmatism understood as an average difference between vertical and horizontal MTF50 function values amounts to 5% so it is low. It’s worth mentioning here that focal lengths from 18 to 35 mm contribute significantly more to this value than 70-140 mm focal lengths.

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You should also praise the appearance of images out of focus. The circles created by defocused light points show an even spread; only an increased intensity of the rim you see on the very edge is something you can complain about.