Sony FE 40 mm f/2.5 G
5. Chromatic and spherical aberration
Chromatic aberration
The following photos show that the tested lens didn't manage to avoid problems connected to longitudinal chromatic aberration. Sony optics specialists didn't add low dispersion glass elements to the construction and their absence makes itself felt. |
Now let's check the situation of lateral chromatic aberration -the lens's performance, depending on aperture values, for both types of detector presents a graph below.
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The biggest chances to notice that aberration you get near the maximum relative aperture but even there its level remains low. Near f/4.0-f/5.6 the aberration decreases to negligible levels and the chances to notice it in your photos practically drop to zero.
| A7R III, RAW, FF, f/2.5 | A7R III, RAW, FF, f/11.0 |
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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, with a tad different light spread inside them, but the differences aren't huge. You can draw a conclusion that the Sony 2.5/40G doesn't have any significant problems with correction of spherical aberration.
| A7R III, f/2.5, before | A7R III, f/2.5, after |
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