sure thing, the big chips are here:
http://www.teddillard.com/2008/08/big-chips.html
ok, uh, lemmee see.
from the inside out...
white- 35mm
blue- Leica S2
gold- Hassey HD3II50
green- Leaf
purple- Phase
yellow- full 645
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This is the physical difference, (not pixel count, just physical size).
[attachment=8559:attachment]
And it really doesn't tell you much because so much depends on the iso, the available range of lenses and of course costs.
Interesting is how close in physical size the S2 is to the P30+ (or Hasselblad 31), so I guess a lot of that decisiion will come down to price or either the bling of a Leica.
Then again as I was doing this I thought how silly it is, because it tells you nothing of resolving power, or how any of these cameras work at higher to lower isos, color casts, anything for that matter, other than the aspect ratio.
We can all test and compare these things until our belt buckles fall off, but in the end the decision really is made on what and how you shoot.
What i should have done is put a dollar value on each of these image sizes. That would probably open up a lot of eyes.
(BTW: this original shot I used a p21+ which I am positive is more cost effective than any of the backs listed here).
JR