Nikon Nikkor Z 70-200 mm f/2.8 VR S
7. Coma, astigmatism and bokeh
| Center, 70 mm, f/2.8 | Corner APS-C, 70 mm, f/2.8 | Corner FF, 70 mm, f/2.8 |
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| Center, 135 mm, f/2.8 | Corner APS-C, 135 mm, f/2.8 | Corner FF, 135 mm, f/2.8 |
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| Center, 200 mm, f/2.8 | Corner APS-C, 200 mm, f/2.8 | Corner FF, 200 mm, f/2.8 |
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Astigmatism, understood as an average difference between vertical and horiztontal MTF50 function values, amounted to 16.4% so can be placed on the borderline between medium and high levels. Still, it should be noticed that the 70 mm focal length contributes the most to that result as its astigmatism reaches over 18%; in case of longer focal lengths the levels are lower, hovering around 15-16%.
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Defocused circles of light look quite nice, especially when you remember that you deal here with a zoom lens. You can't notice any distinct traces of onion-ring bokeh, or any especially bright rim. Mechanical vignetting makes itself felt, though, being very visible by f/2.8, distinct by f/4.0 and still accented by f/5.6.
| Center, 200 mm, f/2.8 | Corner APS-C, 200 mm, f/2.8 | Corner FF, 200 mm, f/2.8 |
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| Center, 200 mm, f/4.0 | Corner APS-C, 200 mm, f/4.0 | Corner FF, 200 mm, f/4.0 |
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Center, 200 mm, f/5.6 | Corner APS-C, 200 mm, f/5.6 | Corner FF, 200 mm, f/5.6 |
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