Panasonic Leica DG Vario-Summilux 10-25 mm f/1.7 ASPH review - Coma, astigmatism and bokeh

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Panasonic Leica DG Vario-Summilux 10-25 mm f/1.7 ASPH

23 September 2019

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Panasonic Leica DG Vario-Summilux 10–25 mm f/1.7 ASPH perhaps doesn't correct coma in a perfect way but still you can say it does the job properly well. The diode in the very corner of the frame is not point-like but, at the same time, its deformations cannot be called big or even medium.

E-M5 II, 10 mm, f/1.7, Center	E-M5 II, 10 mm, f/1.7, Corner

E-M5 II, 17 mm, f/1.7, Center	E-M5 II, 17 mm, f/1.7, Corner

E-M5 II, 25 mm, f/1.7, Center	E-M5 II, 25 mm, f/1.7, Corner

Astigmatism of the Panaleica 10-25 mm, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 11.3% and it is a value which we place in the upper part of the medium level. It's worth adding that aberration is quite evenly distributed between all focal lengths.

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Out-of-focus areas, provided by the Panaleica, look sensibly well but here you can express some reservations. There is a noticeable rim around the circles. You also can notice very slight, concentric rings, stemming most likely from the usage of aspherical elements. Mechanical vignetting makes itself felt a lot as well, even after significant stopping down.

E-M5 II, 25 mm, f/1.7, Center	E-M5 II, 25 mm, f/1.7, Corner

E-M5 II, 25 mm, f/2.5, Center	E-M5 II, 25 mm, f/2.5, Corner

E-M5 II, 25 mm, f/3.5, Center	E-M5 II, 25 mm, f/3.5, Corner