Venus Optics LAOWA 7.5 mm f/2 MFT review - Coma, astigmatism and bokeh

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Venus Optics LAOWA 7.5 mm f/2 MFT

9 October 2017

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Venus Optics LAOWA 7.5 mm f/2 MFT has serious problems concerning coma and other optical aberrations which cause deformations of point-like images of light sources in the frame corners. In fact the coma can be noticed even on stopping down the aperture by 1-2 EV.

E-M5 II, f/2.0, center	E-M5 II, f/2.0, corner

E-M5 II, f/2.8, center	E-M5 II, f/2.8, corner

Night sky presents a similar result – once again there are noticeable deformations of stars on the edge of full frame which shapes look like the shape of the diode described earlier.

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E-M5 II, JPEG, f/2.0, top left corner of the frame 1:1

Venus Optics LAOWA 7.5 mm f/2 MFT - Coma, astigmatism and bokeh

E-M5 II, JPEG, f/2.8, top left corner of the frame 1:1

E-M5 II, JPEG, f/4.0, top left corner of the frame 1:1

The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, reached 9.1%. It is a value on the borderline between low and average level. It should be also noticed that the astigmatism makes itself felt mainly by f/2.0 and f/2.8; from f/4.0 onwards it becomes negligible.

With the Laowa’s 2/7.5 parameters it is really difficult to obtain wide out-of-focus areas in your photos. Still their appearance is not something you could call a crucial feature of this lens. It’s a good thing because the appearance of circles of light is just moderately good - you can see a lot of brightness gradients, deformations, and also poor round shape provided by the aperture with 7 diaphragm blades.

E-M5 II, f/2.0, center	E-M5 II, f/2.0, corner

E-M5 II, f/2.8, center	E-M5 II, f/2.8, corner

E-M5 II, f/4.0, center	E-M5 II, f/4.0, corner