As I mentioned earlier there are scanning backs that do exist that are 4x5 and I believe 8x10 as well.
There's this one that is actually just a normal 8x10 digital back and only costs $250,000
http://www.aphotoeditor.com/2011/08/...-capture-back/
And these are the normal 4x5 scanning backs often used ...
http://www.betterlight.com/why_better.html
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