I got the adapter yesterday and tried two 32GB micro SDHC cards. I formated in the D50 as the eBay auction specified, and it showed 30+ hours available, ran it overnight, had to change batteries after about 17 hours as it was flashing low (but I think it would have continued to run for another few hours based on the recharge of the 2400 mAh Imedion cells, which only took 1800 mAh of refill). It keeps saying "UNKOWN MEDIA" everytime I start it up with this card, but if I ignore that and press play it reverts to normal. I recorded about 28 hours of files, they spot-check out okay.
Jeff