On Nov 7, 2010, at 7:31 PM, Adam Maas wrote:
Paul,
if you adjust the files for maximum dynamic range, the K-5 will have
more dynamic range and less contrast than the K-7. Neither file will
be usable in that state. As a practical matter more dynamic range
moves the choice about what to blow from exposure to post.
-Adam
That makes sense. I don't think about the technology when I convert
pics or process them further after conversion. But I know what I want,
and choices are a good thing. I was happy with the K-7 files for the
most part, and, while it's early, I'm even more pleased with those
from the K-5. If I can wring the pic I want out of the RAW, I'm happy.
Paul
On Sun, Nov 7, 2010 at 3:01 PM, paul stenquist <[email protected]
> wrote:
I see no real difference in contrast levels between K-5 and K-7 raw
files. And how flat or contrasty the final image might be can be
controlled completely in conversion. It's not an issue. I shot most
of yesterday's images in shade with no flash fill, so they were
inherently somewhat flatter than what I might generally produce.
However, when the sun stepped in, contrast levels were quite high.
For example:
http://photo.net/photodb/photo?photo_id=11910635
On Nov 7, 2010, at 2:31 PM, Jack Davis wrote:
Don't know if the lack of contrast you reference is so significant
as to be obvious in casually examining prints, but I have noted,
in what relatively few K-5 images I've viewed, contrast has
appeared somewhat low and the image, of course, a bit "flat".(?)
Jack
--- On Sun, 11/7/10, Adam Maas <[email protected]> wrote:
From: Adam Maas <[email protected]>
Subject: Re: On K-5 dynamic range. Somewhat tangential question.
To: "Pentax-Discuss Mail List" <[email protected]>
Date: Sunday, November 7, 2010, 10:18 AM
On Sun, Nov 7, 2010 at 12:46 PM,
Boris Liberman <[email protected]>
wrote:
Hmmm, so a camera with so many bits of RAW can do what
then? Discern
2^so many shades, right?
Exactly.
And the dynamic range is about when it goes
to saturation either to pure black and pure white.
Pure white and indistinguishable from noise (not pure
black). The
noise floor determines the actual dynamic range's low end.
Ok, so tell me
then, the wise people of PDML, is there a way looking
at the same
picture shot with K-7 and K-5 to tell them apart? Or
better yet, how
do I /see/ that one camera has wider DR than the other
and that more
BPS in RAW are more beneficial than less BPS in RAW in
real life. And
how all that translates to actual print?
The bit depth of the RAW files shows up in subtle
gradations of colour
and in shadow noise. You get more subtle colour/tone
resolution and
less shadow noise with a higher bit depth ADC than with
less (the
shadow noise improvement is due to exactly how ADC's work
with linear
imaging sensors, you lose luminance resolution at low
luminance
values. Digital delivers superb resolution of bright tones
and poor
resolution of dark tones). In the real world, shadow noise
is the
easiest to see, especially on a camera which can shoot in
both 12 and
14 bit modes like many Nikons.
More dynamic range allows you to make less trade offs in
exposure at
shooting time. The more DR you have, the more you can hold
detail in
both the highlights and the shadows at the same time. The
downside is
the self-same image will be lower contrast when rendered
and you
usually have to make those trade offs in post instead.
-Adam
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