Olympus M.Zuiko Digital 75 mm f/1.8 ED
5. Chromatic and spherical aberration
Chromatic aberration
There is no doubt that using such a big number of low-dispersion elements provided good results. The chromatic aberration level is slight and its correction – very good.
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It’s even better when it comes to the lateral chromatic aberration. Such low values, kept throughout such a wide range of apertures, we haven’t seen for a long time. Brilliant!
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Spherical aberration
Spherical aberration is not corrected in a perfect way but it would be difficult to speak about some serious problems here. First of all we haven’t noticed any focus shift effect. Some traces of spherical aberration can be noticed in defocused images of a point-like diode as differences in the very edge of the circles. In the case of the back focus image you see a light ring; the same ring is far less distinct in the case of the front focus image. Still, as soon as you forget the rim of the circle you can notice that inside the light spread is smooth and even in both cases.
