Panasonic G X VARIO 35-100 mm f/2.8 P.O.I.S. review - Coma, astigmatism and bokeh

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Panasonic G X VARIO 35-100 mm f/2.8 P.O.I.S.

22 March 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is corrected very well. You can notice slight deformations of the point-like image of a diode only at the shortest focal length. In the 63-100 mm range the coma is practically imperceptible.

Panasonic G X VARIO 35-100 mm f/2.8 P.O.I.S. - Coma, astigmatism and bokeh

The astigmatism is also not an especially serious problem. In fact it can be noticed only at the maximum relative aperture. The average difference between vertical and horizontal MTF50 function values amounted to less than 6%.

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When it comes to defocused images of light points the most serious reservation can be expressed about images in the corners – they are very truncated and such an effect can be perceived even by f/5.6. The tested Panasonic is a top-of-the-range lens so such a result is nothing to be proud of. Fortunately the light spread in the circles is even – there are no distinct rings , patches or local extremes.