Sony FE 50 mm f/2.5 G
5. Chromatic and spherical aberration
Chromatic aberration
Just one low dispersion element in the optical construction of the Sony 2.5/50G is perhaps not enough to eliminate longitudinal chromatic aberration. Its influence, visible as delicate colouring of images on the border of depth of field, can be noticed but is not high. What's more, it disappears almost completely on stopping down the aperture by 1 EV. In this category the new lens still fares better than the Sonnar 1.8/55 even if both these instruments are placed at the same price-point. |
Now let's check how the tested lens corrects lateral chromatic aberration – its performance, depending on the type of detector and aperture values presents a graph below.
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In this category the results are simply sensational. The aberration keeps a negligible level of 0.01-0.02% so is corrected in an exemplary manner. A round of applause!
| A7R III, RAW, FF, f/2.5 | A7R III, RAW, FF, f/16.0 |
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Spherical aberration
First photos of this chapter don't show any noticeable 'focus shift' effect. When it comes to cricles of light generated before and behind the focal point they aren't identical - a ligher edge in one of them is not visible in the other. Still, you can draw a conclusion that the Sony 2.5/50G doesn't have any significant problems with correction of spherical aberration even though it doesn't correct it in a perfect way.
| A7R III, f/2.5, before | A7R III, f/2.5, after |
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