Nikon Nikkor AF-S 24-70 mm f/2.8E ED VR
7. Coma, astigmatism and bokeh
| Center, 24 mm, f/2.8 | Corner APS-C, 24 mm, f/2.8 | Corner FF, 24 mm, f/2.8 |
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| Center, 45 mm, f/2.8 | Corner APS-C, 45 mm, f/2.8 | Corner FF, 45 mm, f/2.8 |
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| 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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The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.8%. It is a slight value which shouldn’t worry you at all. Still from a top-of-the-range lens we would expect a result lower than 5%. By the way if you split that average value into particular focal lengths you’ll find out that the maximum focal length is the weakest of all as its astigmatism level reaches 11% - it is already a medium level.
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The blurry areas the Nikkor AF-S 24–70 mm VR provides are pleasing to the eye. Looking at the out-of-focus circles of light you might notice two slightly disturbing things. First - a lighter rim at the edge of the circle; second - a trace of ‘onion ring’ bokeh. You can also complain a bit about the distinct truncation of the circle in the very corner of the frame, visible even by f/5.6. That last problem, though, doesn’t influence the blurry areas in a significant way; still it is important when it comes to the vignetting.
| 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, 70 mm, f/4.0 | Corner APS-C, 70 mm, f/4.0 | Corner FF, 70 mm, f/4.0 |
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Center, 70 mm, f/5.6 | Corner APS-C, 70 mm, f/5.6 | Corner FF, 70 mm, f/5.6 |
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