Panasonic Leica DG Vario-Elmar 100-400 mm f/4.0-6.3 ASPH. POWER O.I.S. review - Coma, astigmatism and bokeh

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Panasonic Leica DG Vario-Elmar 100-400 mm f/4.0-6.3 ASPH. POWER O.I.S.

12 June 2016

Arkadiusz Olech

7. Coma, astigmatism and bokeh

Thumbnails below prove that the coma is not a problem whatsoever for the tested lens. Very slight deformations of the diode’s shape are visible only at the shortest focal lengths but even there they shouldn’t bother you at all.

G7, 100 mm, f/4.0, center	G7, 100 mm, f/4.0, corner

G7, 200 mm, f/5.1, center	G7, 200 mm, f/5.1, corner

G7, 300 mm, f/5.6, center	G7, 300 mm, f/5.6, corner

G7, 400 mm, f/6.3, center	G7, 400 mm, f/6.3, corner

The situation concerning astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, looks different though. Its value is significant, amounting to 16.8%. If you take into account only the 300-400 mm range that result increases to 23%. It’s obvious the astigmatism has a very measureable influence, limiting the resolution of this lens.

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When it comes to the appearance of defocused circles of light you shouldn’t complain. The only thing you can carp about is a rim on the edge which intensity increases on stopping down.

G7, 300 mm, f/5.6, center	G7, 300 mm, f/5.6, corner

G7, 300 mm, f/8.0, center	G7, 300 mm, f/8.0, corner

G7, 300 mm, f/11, center	G7, 300 mm, f/11, corner