Samyang AF 24 mm f/1.8 FE
5. Chromatic and spherical aberration
Chromatic aberration
The Samyang AF 24 mm f/1.8 FE still experiences some problems in this area. They mainly concern longitudinal chromatic aberration, which can be noticed without any problems by f/1.8 and on stopping down the aperture by 1 EV as well. Taking into account the number of special elements in the construction of this lens, especially two made of low dispersion glass, this kind of performance let us down a bit. |
On the edge of full frame this aberration increases on stopping down the aperture from f/1.8 to f/5.6, ranging from practically zero to 0.03%. As any result below 0.04% we qualify as a very low level, here we have no reasons to complain.
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In previous chapter we mentioned the fact that on the edge of the APS-C sensor you deal with a higher level of chromatic aberration. It increases on the edge of full frame as well with stopping down the lens but this time it ranges from 0.03% to over 0.07%. It is not a level you can call bothersome so also in this case our assessment remains positive.
| A7R III, RAW, FF, f/1.8 | A7R III, RAW, APS-C, f/16.0 |
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Spherical aberration
It would be difficult to notice any distinct focus shift in first photos of this chapter so we think the lens doesn't have any problems with that.When you look at out-of-focus circles produced before and behind the focal point you see their appearance is far from perfect; still, there are no distinct differences between them. To sum up you can say the tested lens doesn't experience any serious problems with correction of spherical aberration.
| A7R III, f/1.8, before | A7R III, f/1.8, after |
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