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Forum: Pentax SLR Lens Discussion
11-05-2017, 11:02 AM
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Tony Nrotrupp has nice presentational skills but as the preceding posters have said he is well not FoC, just wilfully misleading. The implication of what he says is that lenses are slower on a smaller sensor, this is just plain wrong. The "speed" of a lens ie its widest F-stop (= max light transmittance) , is a physical characteristic of the lens and doesn't change, regardless of what camera you put it on. And it is that that determines exposure. To put alamo5000's rain bucket analogy a different way, the exposure depends on light intensity, not on how big the sensor is/the total number of photons hitting it.
So the photograhic effect you may notice is, as normhead pinpoints, more depth of field on smaller sensor(s).
There is a benefit of using full frame lenses on apsc: you are selecting (effectively cropping) the centre of the image circle projected by the lens, this has the best IQ!
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