Sony Alpha A900 Digital SLR - Test Shots - ISO Performance

Over the next few pages we show a range of test shots. On this page the full size image at the minimum and maximum ISO settings have been reduced to let you see the full image, and a series of full resolution crops have taken from original images at a range of ISO settings to show the overall image quality. These were shot in Raw mode and then converted using Adobe Camera Raw, with 25 percent chroma noise reduction.

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This is the full frame at 100 ISO.

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Not too surprisingly, flawless image quality at 100 ISO.

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No noticeable difference at 200 ISO.

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there is a little noise grain showing through at 400 ISO, but it's not enough to cause a problem.

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Slightly more texture at 800 ISO, but the effect is not dissimilar to film grain.

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There's a little colour noise creeping in at 1600 ISO, but overall quality is still good.

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Noise is now very visible at 3200 ISO.

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Image quality at 6400 ISO is not as good as some rivals, notably the Canon EOS 5D MkII.

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This is the full frame at 6400 ISO.

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