In advance of this month's Photokina 2008 expo, camera maker Mamiya has announced a new digital back for medium-format cameras. The ZDb is a revision of the company's current digital back (pictured), and like its sibling, will sport a 22-megapixel resolution. The key difference will be a new buffer with twice the memory, able to shoot up to 22 full-quality RAW files before offloading. The curre
