Sony FE 14 mm f/1.8 GM
5. Chromatic and spherical aberration
Chromatic aberration
When you test a construction that is simply larded with ED and Super ED elements you can count on good correction of longitudinal chromatic aberration. Photos below show that in this area the Sony lens indeed has no problems whatsoever. |
Now let's take a look at lateral chromatic aberration correction – an appropriate graph you can find below.
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No reservations here - the results are very good, especially taking the parameters of the tested lens into account. Aberration decreases to less than 0.08% at the maximum relative aperture, and on more significant stopping down it is 0.04-0.06% - all these values can be described only as low. In the case of the rival Sigma aberration increased slightly on stopping down but the range of values was very similar to that of the Sony. It seems in this category you can announce a draw.
| A7R III, RAW, f/1.8 | A7R III, RAW, f/11.0 |
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Spherical aberration
In first photos of this chapter it would be difficult to notice any 'focus shift' symptoms even if you take a closer look – significant depth of field influenced that result without doubt. Still some traces of weaker correction of spherical aberration are visible in circles of light we reached before and behind the focus – a brighter rim on the edge in the case of the former and soft edges in the latter.No significant focus shift and a very good image quality in the frame centre by f/1.8 allow us to suggest that spherical aberration is kept in check quite efficiently – even if there are some problems, they aren't especially pronounced.
| A7R III, f/1.8, before | A7R III, f/1.8, after |
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