In general, the higher the ISO setting on your camera, the more noise will be recorded. This is a condition, akin to visible grain in film photography, that occurs in digital imaging when stray electronic information affects the sensor sites. Fortunately, this is less of a problem than it once was.
At this writing, the latest pro DSLRs from Nikon (D3) and Canon (EOS 1Ds Mark III) feature remarkably high ISOs and low noise. Nikon’s D3 even offers a black & white ISO setting that goes up to ISO 25,600 with remarkably low noise. Many DSLRs also feature specialized modes that automatically reduce noise in long-exposure situations. These settings are quite effective, regardless of ISO.
There are also a number of effective noise-reducing applications available for postproduction. Adobe Camera Raw features two types of noise reduction (one for color noise [chrominance] and one for black & white noise [luminance]) that can be applied in RAW file processing. Nik Software’s dFine 2.0 is another very sophisticated noise-reduction program that lets you reduce noise globally or selectively, targeting critical parts of the image.
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