Sigma SD15 - Test Shots – ISO Performance Review

”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 pictures were taken indoors using shaded natural light. ”


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This is the full frame at minimum ISO.


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At 100 ISO the JPEG mode image quality is good, with plenty of fine detail.


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Already at 200 ISO there is visible image noise, although it is very fine grained.


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400 ISO and image noise is more obvious, and saturation is affected.


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Image quality at 800 ISO is pretty poor. It may look like film grain, but it’s still noise.


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1600 ISO and the image quality is very poor, with distorted colour.


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This is the full frame at 1600 ISO.


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