Re: Olympus releases M.Zuiko Digital ED 75-300mm lens

Started Aug 31, 2010 | Discussions thread
Braxton7
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Re: Olympus releases M.Zuiko Digital ED 75-300mm lens
In reply to ppastoris, Nov 2, 2012

ppastoris wrote:

That's right, but the surface area of the image/sensor is (approximately) 4x smaller for m4/3 compared to "35mm". Hence the total light flux too is 4x lower (for the equivalent scene), hence the number of photons per second per sensor is 4x lower, and hence the photonic noise (the variance in the number of photons per sensor per second) is sqrt(4)=2 times higher. In other words you'll get the same number of photons (and the total light flux) with say 75mm f/4.8 lens on a m4/3 sensor as with the 150mm f/9.6 on the full-frame one.

That made me laugh.

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