Olympus M.Zuiko Digital 12-40 mm f/2.8 ED PRO
5. Chromatic and spherical 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.
 |
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.
Please Support UsIf you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 |
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.
