Marc, do the 3 H series digi-backs (22, 31, 39mp) have different crop factors? If so, why would they bother?
So, could a x1.1 back of 22mp then have higher image quality than x1.3 back of 31mp? How do varying crop factors with the varying MP resolutions stack up against each other?
As you can see, this is confusing to me.
PS: I agree that the H3/31MP back bundle at $17,500 is hugely attractive... ah... well to Americans at least...
Simon, yes the backs are somewhat different.
The different backs feature different sensors from Kodak ... Hasselblad/Imacon and Phase One both use the same set of different sensors.
Leaf and Sinar use Dalsa sensors which come in slightly different sizes.
The Kodak 22meg sensor is basically the same pixel pitch as the CFV ... 9X9 microns, only it's almost a full 645 size (1.1X lens factor.) For all practical purposes it is full frame since the aspect ratio
of these sensors better fits actual print sizes.
The Kodak 39 meg is also the same 1.1X 645 size, but obviously with almost twice the pixel count, each pixel "light well" is smaller ... however, not 1/2 the size. Each is 6.7 X 6.7 microns.
This was accomplished by placing the pixels closer together.
The 31 meg backs have the same sized pixels as the 39 ... 6.7 X 6.7 Microns, but have micro lenses installed to increase the effeciency of light gathering ... which results in better speed of capture and the ability
to squeeze an extra stop of top ISO. Not sure why they are a 1.3X lens crop factor other than maybe it has to do with color shift because of the micro lenses. I do know that the 31 meg sensors are not
recommended for T/S work because of color casts attributed to the micro lenses.
The aspect ratio of the 31 meg backs is also effecient for printing, and the speed of operation and capture makes it a very desirable camera for event, location portrait, fashion etc.
It would not surprise me to see the 31 meg back discontinued in future. This would not, nor did it, stop me from getting a new one. It is my favorite digital camera.