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Sony 75-300mm vs Sony 18-70mm wide-angle uniformity comparison
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To compare the vignetting and light fall-off of the Sony 75-300mm against the Sony 18-70mm at their shortest focal lengths, we photographed a white target with a
highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here
at a reduced resolution. Bigger percentages are better.
Light falls off to 73.5% of the maximum when it reaches the corners of the Sony 75-300mm at 75mm. This is a good result, although the 18-70mm zoomed-into 70mm, as seen in the second example, boasts even less fall-off at just 87.7%. So given the choice between the two at around the 70mm focal length, the 18-70mm kit lens is preferable in terms of the least light fall-off. |
Sony 75-300mm
Using Sony Alpha A100 |
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Sony 18-70mm
Using Sony Alpha A100 |
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75-300mm at 75mm f4.5
Mean corner fall-off: 73.5% |
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18-70mm at 18mm f3.5
Mean corner fall-off: 63.3% |
Sony 75-300mm vs Sony 18-70mm telephoto uniformity comparison
To compare the vignetting and light fall-off of the Sony 75-300mm against the Sony 18-70mm at their longest focal lengths, we photographed a white target with a
highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here
at a reduced resolution. Bigger percentages are better.
Zoomed-in to its longest focal length, the 75-300mm performs similarly to how it does when zoomed-out: light falls off to 75.1% of the maximum, which means darkening in the corners won't be particularly noticeable at either end of its focal range. |
Sony 75-300mm
Using Sony Alpha A100 |
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Sony 18-70mm
Using Sony Alpha A100 |
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75-300mm at 300mm f5.6
Mean corner fall-off: 75.1% |
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18-70mm at 70mm f5.6
Mean corner fall-off: 87.7% |
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