No one who has used one, or seen their output, doubts the image quality possible from a medium format back. Yes, DSLRs have now crept into MF back territory when it comes to resolution, but backs have kept pace, and while DSLRs now boast as high as 25 megapixels, the highest resolution backs such as thePhase One P65+, now offer 60 Megapixels. And, of course, there's more to medium format digital than just magapixels.

In addition to their higher resolution medium format backs have other advantages, such as their lack of an anti-aliasing filter, which produces higher accutance, and also that they usually produce true 16 bit files, rather than the 12 bit or 14 bit files from DSLRs. There's even the fact that they use CCD technology rather than the now almost ubiquitous CMOS sensors used in DSLRs, which some workers feel produces higher quality image files.

But, one image quality area where medium format backs have always fallen short is when it comes to high ISO. At ISO 50, 100 an...