LensTip.com

Lens review

Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO

3 June 2020
Maciej Latałło

7. Coma, astigmatism and bokeh

It would be difficult to have any reservations connected to the way the Olympus M.Zuiko Digital ED 12–45 mm f/4.0 PRO corrects coma. Images of a diode in frame corners aren't perfectly point-like but deformations remain slight, never allowing you to complain.

E-M5 II, 12 mm, f/4.0, Center E-M5 II, 12 mm, f/4.0, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh
E-M5 II, 25 mm, f/4.0, Center E-M5 II, 25 mm, f/4.0, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh
E-M5 II, 45 mm, f/4.0, Center E-M5 II, 45 mm, f/4.0, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 3.5% and it is a value considered by us to be very low. It can be mentioned that the aberration had a slight tendency to grow with the increase of the focal length – from 2.0% at 12 mm to 4.8% at 45 mm.


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Out-of-focus areas, provided by the Olympus 12-45 mm, aren't perhaps completely ugly but they can't be called nice either. They differ here and there and that lack of smoothness is caused most likely by the presence of aspherical elements inside the lens. You can also notice a ligher rim. Fortunately the influence of mechanical vignetting disappears already on stopping down the aperture by 1 EV.

E-M5 II, 45 mm, f/4.0, Center E-M5 II, 45 mm, f/4.0, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh
E-M5 II, 45 mm, f/5.6, Center E-M5 II, 45 mm, f/5.6, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh
E-M5 II, 45 mm, f/8.0, Center E-M5 II, 45 mm, f/8.0, Corner
Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO - Coma, astigmatism and bokeh