Panasonic Lumix G 25 mm f/1.7 ASPH. review - Coma, astigmatism and bokeh

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Panasonic Lumix G 25 mm f/1.7 ASPH.

11 March 2016

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Szymon Starczewski

7. Coma, astigmatism and bokeh

The following crops show it clearly that the tested lens doesn’t have almost any coma problems. Here the Panasonic optics constructors definitely deserve a lot of praise, especially that the Panasonic 1.7/25 fares much better than the Panaleica 1.4/25 and the Olympus 1.8/25.

E-M10, 25 mm, f/1.7, center	E-M10, 25 mm, f/1.7, corner

E-M10, 25 mm, f/2.2, center	E-M10, 25 mm, f/2.2, corner

The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 8%. Although it influences the image quality near the maximum relative aperture, the Panasonic fares better here than the Olympus 1.8/25 and it is almost as good as the more expensive Panaleica.

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The out-of-focus circles of light look nicely. The light spread is even, without any distinct local extremes; the only reservation concerns a bit lighter rim on the edge of the circle.

E-M10, 25 mm, f/1.7, center	E-M10, 25 mm, f/1.7, corner

E-M10, 25 mm, f/2.2, center	E-M10, 25 mm, f/2.2, corner

E-M10, 25 mm, f/3.2, center	E-M10, 25 mm, f/3.2, corner