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

Arkadiusz Olech

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