Nikon Nikkor AF-S DX 16-80 mm f/2.8-4E ED VR review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S DX 16-80 mm f/2.8-4E ED VR

7 November 2015

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The tested lens doesn’t manage coma very well. Its level is distinct in the 16-30 mm range, then it decreases slightly but remains quite bothersome at 50 mm and only at the maximum focal length it becomes slight. This is not a performance you would expect from a good quality lens.

D7000, 16 mm, f/2.8, center	D7000, 16 mm, f/2.8, corner

D7000, 30 mm, f/3.2, center	D7000, 30 mm, f/3.2, corner

D7000, 50 mm, f/3.5, center	D7000, 50 mm, f/3.5, corner

D7000, 80 mm, f/4.0, center	D7000, 80 mm, f/4.0, corner

The astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounts to 4.4% so it can be called low. It’s worth mentioning here that with the increase of the focal length you can notice a slight increase of astigmatism too. At 16 mm it reaches just 2.5% but at 80 mm it gets to 6.8%.

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Out-of-focus images look sensibly well for a zoom lens but only that much can be said here. The circles of light presented below don’t match. You see a distinct “doughnut” in the centre and a rim on the edge which becomes more and more intensive on stopping down the aperture.

D7000, 80 mm, f/4.0, center	D7000, 80 mm, f/4.0, corner

D7000, 80 mm, f/5.6, center	D7000, 80 mm, f/5.6, corner

D7000, 80 mm, f/8.0, center	D7000, 80 mm, f/8.0, corner