LensTip.com

Lens review

Carl Zeiss Apo Sonnar T* 135 mm f/2.0 ZE/ZF.2

3 November 2013
Arkadiusz Olech

5. Chromatic and spherical aberration


Chromatic aberration

The longitudinal chromatic aberration is corrected by the tested lens very well. The big front element and the parameters, with a very shallow depth of field, mean the standards are raised very high; despite that fact the Zeiss manages very well here. The aberration is slight – only after looking carefully at the photos, presented below, you can notice that off-focus images do feature some cast.

Carl Zeiss Apo Sonnar T* 135 mm f/2.0 ZE/ZF.2 - Chromatic and spherical aberration



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The lateral chromatic aberration can be described in similar terms. Its maximum value can be observed at the maximum relative aperture but a level of 0.04-0.05% should be considered negligible even there. The stopping down makes this aberration decrease even further so it becomes completely imperceptible.

Carl Zeiss Apo Sonnar T* 135 mm f/2.0 ZE/ZF.2 - Chromatic and spherical aberration

Carl Zeiss Apo Sonnar T* 135 mm f/2.0 ZE/ZF.2 - Chromatic and spherical aberration


Spherical aberration

The first picture in this chapter proves that the lens doesn’t have any problems with the focus shift so the spherical aberration is not active that way. Looking at defocused circles of light you see the image is nice on both sides of the focus. The images differ just in the edges: the circle you get in front of the focus has darker edges and that behind the focus spreads light more evenly. It means the spherical aberration is not corrected in a perfect way but it would be difficult to point here any serious problems.

Carl Zeiss Apo Sonnar T* 135 mm f/2.0 ZE/ZF.2 - Chromatic and spherical aberration