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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