Peter...
I don't see how that is possible. The exact same framed image will
result in the higher megapixel camera having more pixels in any given
area than the lower one.
Another way to run the thought experiment (really restating some of
the points below):
Put a 5D and a Xti both on tripods next to each other each with a
50mm lens and take the same picture of a crowd.
The picture in the frame is not the same - the 5D picture is bigger.
The Xti will have more pixels per face, the 5D will have more faces.
If you move the 5D closer to the crowd (so the framing is the same)
then the 5D and the XTi will have the same number of faces,
and the 5D wins on pixels-per-face (and on noise, too, due to sensor
size).
For a shooter who can never get a telephoto that is long enough, the
XTi does provide a way to put more pixels on the subject than the 5D.
-bw
On Jun 20, 2007, at 12:59 PM, Peter K. wrote:
No Austin. If you and I take an image and I use a 10MP sensor on
say a Rebel XTi and that is half frame camera. And you use one with
12.7 that is full frame, and let us say we take the same exact
image of a group of people. I will have more pixels covering a
small face in the crowd than you will.
As to "useful argument," what I say are things I have proven in
tests. The article may explain things better.
As to Dynamic Range, that is a different subject. Here we are
talking pixel density.
Peter K
----- Original Message ----
From: Austin Franklin <[EMAIL PROTECTED]>
To: [email protected]
Sent: Wednesday, June 20, 2007 5:09:38 AM
Subject: RE: EOS A slightly silly query
Hi Peter,
On the other hand, the pixels density of the 30D and potentially
the 10MP 40D is greater than the 5D. You have more pixels
covering the same area of an image taken side-by-side and framed
identically.
It depends on what you mean by "framed identically". A 10MP
sensor, no
matter what the physical size, that contains the same extents of
the image
will have the same number of "pixels" covering the same image
area. It's
just that the focal length of the lense will have to differ, or the
position
it's shot from will have to differ. But, if you mean standing in
the same
position using the same focal length between the two...then sure,
but the
image extents will be entirely different. It's not really IMO a
useful
"argument".
More pixels means more detail of smaller parts of
the image.
Which means the sensor cells are smaller...which typically gives less
dynamic range, and smaller cell size typically means more noise.
Typically,
larger sensor cells give better overall image quality.
Regards,
Austin
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