Sony 50 mm f/2.8 Macro
8. Vignetting
Taking this all into account we were a bit concerned about the vignetting result. By f/2.8 the light fall-off in the frame corners amounted to as much as 26% (-0.86 exposure value). If you attach the lens to a full frame reflex camera this value will increase significantly for sure as this problem is visible even on a small Sony Alfa 100 sensor.
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Fortunately on stopping down to f/4.0 we see this aberration disappear as the vignetting decreases to an imperceptible level of 9%.
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