Quote Originally Posted by neuroanatomist


Quote Originally Posted by Colin
1.6x applies to the effective equivalent aperture.... So f/4 on full frame is 'faster' in effect, than f/2.8 on a crop sensor.

The 'crop factor' applies to aperture in terms of effective depth of field, but not light-gathering ability - in other words, you'll have the same exposure settings at f/4 on full frame and a 1.6x crop body. But, the full frame sensor will have less noise, so performance in low light will be better.
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Maybe my words were chosen poorly. The sensor itself is, in total, gathering more light, however, the light intensity per area of sensor does not change, so, yes, in terms of exposure requirements for a given ISO sensitivity, yes, that doesn't change. you see it in being able to (all else being equal) use a higher ISO sensitivity for a given noise level.


I never claimed to be Daniel [8-|]