Nikon Nikkor AF-S 300 mm f/4E PF ED VR
7. Coma, astigmatism and bokeh
| Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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The astigmatism, understood as an average difference between horizontal and vertical MTF50 values, amounted to just 3.8%. It is a value considered by us as low. To be honest you should add that the maximum relative aperture had the biggest influence on that result. Stopping down the aperture to f/5.6 makes the astigmatism practically zero.
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You should also praise the appearance of defocused areas. We thought that, because of the implemented technology, there would be a lot of intensive, circular rings in the circles of light. That effect is noticeable but also negligible; it seems the blurred area in photos taken with the Nikkor 4/300 PF will be pleasing to the eye.
| Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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Center, f/8.0 | Corner APS-C, f/8.0 | Corner FF, f/8.0 |
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