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Lens review

Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO

18 December 2013
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

The longitudinal chromatic aberration is corrected very well. The cast in defocused images is negligible and won’t be bothersome in real life photos at all.

Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO - Chromatic and spherical aberration


When it comes to the lateral chromatic aberration the situation is a bit better than the performance of the Panasonic which, at the shortest focal length, got results near 0.08-0.10%. The Olympus 12-40 mm at no combination of focal length and aperture exceeds the low level of 0.07. It is an excellent result. Its performance at the shorter focal length should be especially praised. In fast zoom lenses, with the angle of view of over 80 degrees, correcting the aberration at the shortest focal length so it reduced to an imperceptible level of 0.04-0.05% is no mean feat, something certainly worth emphasizing.

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Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO - Chromatic and spherical aberration

Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO - Chromatic and spherical aberration



Spherical aberration

The first photo of this chapter shows no problem whatsoever with ‘focus shift’. The circles, created by defocusing light points, don’t have any distinct problems connected to the spherical aberration either. The only thing you can notice is a different appearance of the circle itself - in front of the focus the center is darker and behind the focus it becomes lighter.

Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO - Chromatic and spherical aberration