Re: Upgrading from 300D - to 40D or 5D??


"John Sheehy" <JPS@xxxxxxx> wrote in message
news:Xns995AC5830A7DBjpsnokomm@xxxxxxxxxxxxxxxx
"Charles" <charlesschuler@xxxxxxxxxxx> wrote in
news:h_2dnZFaUrJ_sh3bnZ2dnUVZ_tmknZ2d@xxxxxxxxxxx:

The larger sensor will have larger photon sites and thus less noise
and better dynamic range.

The 5D's pixels are very similar to the 30D's in every way except that
they
*can* capture more photons, and are spaced farther apart. They actually
capture the same number of photons at the same ISO, despite the bigger
pixels. Read noise is about the same as the 30D at the pixel level as
well, for the standard ISOs (100/200/400/800/1600). The 5D can give
better
images simply because it has more pixels, and also because since they are
spaced further apart, they are less demanding on the lens for pixel-to-
pixel sharpess.

There is no correlation between ISO (which is only a gain setting on the
amplifiers in digital cameras) and the number of actual photons captured,
given any FIXED exposure time. The bigger photon well captures more of the
little quantum buggers and that's the bottom line for low-noise,
high-dynamic range work. A 30D is hardly much less worthy than a 5D, but
the 5D is indeed a tad better in terms of SNR and dynamic range.

A minor point for many (most) photographers ... it's simply a technical
detail.


.

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