to continue to be a PITA,
his maths formulas and graphs gave me a headache but here is the conclusion
i thought made sense:
'Cameras with larger pixels are NOT inherently less noisy. The larger pixels
only enable more light to be collected to produce higher signal-to-noise
ratio images. But it is the lens and exposure time that deliver the light to
the pixels.
Larger pixels = less detail. It is a continuum trade between detail and
light per pixel. There is no free lunch. If you want the same detail on a
subject as a camera with smaller pixels, and you increase focal length to
get that detail, you won't have higher signal-to-noise ratio images just
because your camera has larger pixels. With the same detail and same lens
diameter, you'll get the same signal-to-noise ratio per pixel regardless of
pixel size for a given exposure time. No free lunch and no magic large
pixels.
Lens aperture is equally important to focal length in overall system
performance. Buy the largest aperture lens you can afford and that you have
the ability to carry."
