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Sony Alpha DSLR-A100 corner sharpness comparison using DT 18-70mm f3.5~5.6
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To measure and compare the Sony
DSLR-A100's corner sharpness we photographed the Enhanced Digital Camera
Resolution Chart with it and a number of rival models, each using their
best quality JPEG and default image tone and sharpening settings. The Konica
Minolta 5D and Sony Cybershot DSC-R1 were tested using our older chart,
but the results are comparable.
We used the bundled lenses at their widest and longest focal lengths and
with various apertures in Aperture Priority mode. The crops are taken from
the extreme lower left corner of the chart and presented here at 100%. |
The results below confirm the Sony DSLR-A100's bundled DT 18-70mm lens
is identical to the DT 18-70mm bundled with the Konica Minolta 5D. The charts
may have changed, but the corner problems at wide angle with a fully open
aperture still remain.
The wide angle results improve considerably as you move into the frame,
but if you want sharp corners at the 18mm focal length, you'll need to stop
the aperture down. The Canon 18-55mm bundled lens performs much better here,
although the clear leader is Sony's own R1 with its built-in lens - this
is even more impressive considering its maximum f2.8 aperture.
Zoom-in to the telephoto end though and the situation improves dramatically.
The Sony DSLR-A100 with DT 18-70mm performs much better in the corners at
70mm, exhibiting only slight softness with the aperture wide open. This
is however par for the course against its rivals.
Note: crop details taken from the same chart which appear smaller here are
due to them being captured with lower resolution cameras and / or a lens
which couldn't focus as close to the chart. In each case though, the crop
still represents the extreme left corner of each camera's frame. |
Sony DSLR-A100 |
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Canon EOS-350D |
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Konica Minolta 5D |
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Sony Cyber-shot DSC-R1 |
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18-70mm DT at 18mm f3.5 |
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18-55mm EF-S at 18mm f3.5 |
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18-70mm DT at 18mm f3.5 |
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14.3-71.5mm at 14.3mm f2.8 |
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18-70mm DT at 18mm f8 |
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18-55mm EF-S at 18mm f8 |
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18-70mm DT at 18mm f8 |
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14.3-71.5mm at 14.3mm f8 |
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18-70mm DT at 18mm f16 |
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18-55mm EF-S at 18mm f16 |
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18-70mm DT at 18mm f16 |
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14.3-71.5mm at 14.3mm f16 |
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Sony DSLR-A100 |
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Canon EOS-350D |
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Konica Minolta 5D |
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Sony Cyber-shot DSC-R1 |
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18-70mm DT at 55mm f5.6 |
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18-55mm EF-S at 55mm f5.6 |
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18-70mm DT at 55mm f5.6 |
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14.3-71.5mm at 71.5mm f4.8 |
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18-70mm DT at 55mm f8 |
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18-55mm EF-S at 55mm f8 |
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18-70mm DT at 55mm f8 |
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14.3-71.5mm at 71.5mm f8 |
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18-70mm DT at 55mm f16 |
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18-55mm EF-S at 55mm f16 |
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18-70mm DT at 55mm f16 |
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14.3-71.5mm at 71.5mm f16 |
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