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Old Feb 26, 2004, 3:49 AM   #1
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Default Does the 1.6 factor go for all lenses?


Does anyone know whether the 1.6 x factor goes for every lens to the 300D - or just the new EF-S lens?

Is it so that every EF lens should be multiplied with 1.6 making a 28-200 into 44-320?


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Old Feb 26, 2004, 4:22 AM   #2
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Yes, thats correct.

The multiplier is a "feature" of the camera, not the lens.
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Old Feb 26, 2004, 4:17 PM   #3
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Applies to all lenses.

Because it's a function of the camera, not a fancy feature of the lens.

It's because the CMOS image sensor in the back of the digital camera is smaller than the frame of a 35mm film.

Think of it, if you like, as taking a 35mm shot, printing it, then cutting a strip off all four edges of the print, then blowing what's left up as your final print. Or a permanent "zoomed in a bit more" factor.

Whatever lens you use, only that middle rectangle of the "Normal" image ends up captured by the CMOS.

Sensors get bigger - there are already D-SLRs with "full size" sensors (e.g. same size as a 35mm film frame) so the lens "factor" for those is 1:1.
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Old Feb 26, 2004, 7:55 PM   #4
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here is a great link which does a very good job of explaining this:

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