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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Crop factor - PanoTools.org Wiki</title>
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<h1 id="firstHeading" class="firstHeading">Crop factor</h1>
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<p>The <b>crop factor</b> or <b>focal length multiplier</b> is
the ratio between the size of the <a href="CCD.html" title="CCD">CCD</a> sensor in your camera and the size of a typical 35mm film frame.
</p><p>Usually CCDs are smaller, so the <b>crop factor</b> for a pocket camera can
be around 6 and the crop factor for a DSLR is usually around 1.5.
Some DSLRs have a 35mm size sensor so the factor for these is 1.
</p><p>Alternatively it is easy to calculate as the ratio between the actual
<a href="Focal_Length.html" title="Focal Length">Focal Length</a> and the 35mm equivalent focal length of the camera. Those two
values can be found on the specification page of any digital camera
where the CCD/CMOS size is harder to find
</p><p>External link: The digital crop factor explained
</p>
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