Olympus M.Zuiko Digital ED 25 mm f/1.2 PRO review - Vignetting

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Olympus M.Zuiko Digital ED 25 mm f/1.2 PRO

10 January 2017

Arkadiusz Olech

8. Vignetting

Let’s glance at thumbnails below to assess the vignetting performance of the tested lens for JPEG files from the Olympus O-MD E-M5 Mark II.

Olympus E-M5 II, f/1.2	Olympus E-M5 II, f/1.4

Olympus E-M5 II, f/2.0	Olympus E-M5 II, f/2.8

At the maximum relative aperture the vignetting reaches 38% (-1.38 EV). It is a distinct level but, taking into account the fastness of the lens, still acceptable. The vignetting of the slower Panaleica 1.4/25 was definitely higher (49%). On stopping down the aperture to f/1.4 the vignetting decreases to 33% (-1.15 EV), becoming moderate by f/2.0 where it reaches just 19% (-0.62 EV). Problems practically end by f/2.8 and f/4.0 where we got the following results: 13% (-0.39 EV) and 8% (-0.25 EV) respectively.

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When it comes to RAW files the vignetting level was a bit higher due to a slightly bigger area they cover. Still the differences between them and JPEG files didn’t exceed 2% so were bordering margin of error.