Articles
2009-12-01
A history of Sony Alpha - Minolta AF 50 mm f/1.7 versus Sony DT 50 mm f/1.8 SAM
8. Vignetting
In this category we should expect a victory of the full frame Minolta. On the other hand, though, the Sony is a bit less fast, has bigger dimensions and its rear element is as big as that of the Minolta so it is definitely not fighting a losing battle.
| Minolta AF 50 mm f/1.7 – f/1.7 | Sony DT 50 mm f/1.8 SAM – f/1.8 |
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| Minolta AF 50 mm f/1.7 – f/2.0 | Sony DT 50 mm f/1.8 SAM – f/2.0 |
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| Minolta AF 50 mm f/1.7 – f/2.8 | Sony DT 50 mm f/1.8 SAM – f/2.8 |
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The comparison of the results is to the Sony’s disadvantage, though. At the maximum relative aperture the Sony loses 38% of light in the corners whereas the Minolta – 33%. The difference is getting bigger by f/2.0. The Sony loses 35% of light, the Minolta – only 25%. Fortunately in both cases by f/2.8 the vignetting problem disappears. In the case of the Sony it amounts to 13%, in the case of the Minolta – to 11%.
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