Pre-PMA 2004: Phase One today announced two new medium format backs, the 22 megapixel P25 and the 16 megapixel P20. These backs, unlike others, can be used both tethered and now totally untethered. The P25 has a 48.9 x 36.7 mm (1.9 x 1.4 in) 22 megapixel CCD sensor, the P20 has a 36.9 x 36.9 (1.5 x 1.5 in) 16 megapixel CCD sensor. Both new backs have 2.2" LCD Monitors, Lithium-Ion battery power a Compact Flash shot and Firewire port and are available for the Mamiya 645 AFD, Hasselblad H and Contax 645. The P25 will additionally be available for the Hasselblad V.