I was wondering what the ratio would give. Are you certain about this
number? I was just hoping it would be a little higher. The 12
coming down to 9.5 or something.
I used the ratio of active areas
12.3 / [(23.7 * 15.5) / (17.3 * 13.9)]
The Nikon figure was from the D50 (1.53x) but I assume it can't
differ much on the D300.
Hmmm... I'm not sure I agree with you there. Well.. maybe a Nikon
conversion will give even LESS chroma noise, but even using ACR/LR
there isn't much there as is.
Here's the D2X, Nikon's JPEG vs. a conversion without any NR at all:
http://www.pbase.com/jps_photo/image/86735542/original
Not the D300 of course, but it makes a case for Nikon NR being
advanced already then. ACR does NR too, no way around it.
People looking straight at the raw data, before conversion,
http://theory.uchicago.edu/~ejm/pix/20d/posts/tests/D300_40D_tests/
find the D300 and 40D to be very similar. Any difference in amount
and look of noise between them will in most cases be down to the
conversion. It would be interesting if someone could do a comparable
analysis on the 4/3rds sensors.
the problem is the banding!
Yes, I know, got it on my 350D. It typically has to do with how the
camera deals with the masked pixels around the imaging area that is
used for determining the blackpoint. E.g. the K10d had a sensor with
too few masked pixels around the sensor, but also the handling by
the camera of those pixels was not the best, so it had a pretty big
banding problem when brightening shadows or shooting high ISO.
(Without it, it would have been a killer for dynamic range, apparently.)
I also understand that if the camera doesn't clip the black end of the raw
data and leaves the masked pixels in the raw file, a sufficiently smart raw
conversion can suppress the banding pretty well. Adobe, e.g. apparently
only do anything about it when they think it's needed.
So, anyway, banding is typically a shared responsibility between sensor,
camera and raw conversion.
Just my two oere
Erik from Sweden
--
CA is a chromatic abbreviation