When one compares focal length, many times we use the 35mm equivalent length. A 50mm lens on an APS-C sensor camera(1.6x) would be a 80mm equiv. length on a full frame camera.
But when we state the aperture of a lens, I do not typically see the aperture given in terms of the sensor size. I recently read an article that did take the sensor size into account Sony DSC RX100 Hands-on (see the sensor comparison chart).
For example if one is looking at a point and shoot lens they will say that it has a f/2.0 lens, when clearly this is not the same depth of field as a f/2.0 lens on a full frame DSLR. Is there a reason that it does not make sense to regularly compare the aperture range of a camera or lens while taking the sensor into account?
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