Pentax smc FA 43 mm f/1.9 Limited
5. Chromatic aberration
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The lateral chromatic aberration is a definitely more serious problem. Its level is high already at the maximum relative aperture and then it even increases a bit, reaching a peak of 0.2% by f/2.8. Fortunately soon afterwards it begins to decrease, dropping to the level of 0.15% so the borderline between levels medium and high. It’s obvious that the chromatic aberration is one of reasons why the resolution on the edge of the frame, especially near the maximum relative aperture, is so limited.
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