A history of Sony Alpha - Minolta AF 85 mm f/1.4 G D versus Sony Zeiss Planar T* 85 mm f/1.4
7. Coma and astigmatism
| Minolta AF 85 mm f/1.4 G D |
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| Zeiss Planar T* 85 mm f/1.4 |
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The first thing that sticks out is not coma but rather the Minolta’s astigmatism; amounting to 16%, it doesn’t allow to get a spot picture of the diode, as it was in the case of the Sony, which astigmatism at the level of 9% is lower. A higher level of astigmatism for an older lens shouldn’t surprise us at all because, as the time goes by, this aberration has a tendency to increase due to slight operating slacks in the casing and by elements shift. On the other hand, though, the G series was the best and the most expensive Minolta lenses series and it was supposed to be designed to withstand years of intensive wear and tear.
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Returning to the coma, we could write that also in this category the Sony performs better. In the APS-C sensor corner the coma problem practically doesn’t exist in both cases, although if you look closely the Minolta’s result seems to be a tad worse. In the full frame corner there’s no doubt that the Sony fares better.
