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Sony 75-300mm vs Sony 18-70mm resolution comparison
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To measure and compare the Sony 75-300mm's resolving power we photographed the Enhanced Digital Camera
Resolution Chart with it and the DT 18-70mm kit lens using the Sony A100 body set to its
best quality JPEG and default image tone and sharpening settings.
The crops are taken from the original images, saved as High Quality JPEGs
in Photoshop CS2 and presented here at 100%. Each number represents 100
lines per picture height (lpph), so a figure of 20 means a resolution of
2000 lpph. |
We tested the Sony 75-300mm with the Sony A100 body at a focal length of 75mm and compared it to the DT 18-70mm at a focal length of 70mm. The sharpest results on both lenses were found at an aperture of f8, where the 75-300mm lens delivered 2000 and 2050 lpph of horizontal and vertical resolution respectively.
This result is measurably lower than the 18-70mm kit lens, at their closest focal lengths anyway, so if you're shooting at around the 70mm point, you'll get better results using the kit lens zoomed-into 70mm than the 75-300mm zoomed-out to 75mm. To be fair, the Sony 18-70mm kit lens is better than most though, and the A100's resolving power with the 75-300mm aren't far off the Canon EOS 400D / XTi with its 18-55mm kit lens. |
Sony 75-300mm at 75mm
Using Sony Alpha A100 |
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Sony 18-70mm at 70mm
Using Sony Alpha A100 |
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2000 lpph, 75-300mm at 75mm, f8, 100 ISO |
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2150 lpph, DT 18-70mm at 70mm, f8, 100 ISO |
Sony 75-300mm at 75mm
Using Sony Alpha A100 |
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Sony 18-70mm at 70mm
Using Sony Alpha A100 |
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2050 lpph, 75-300mm at 75mm, f8, 100 ISO |
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2100 lpph, DT 18-70mm at 70mm, f8, 100 ISO |
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