iOS 4.2 reduces the maximum power output of the iPad Camera Connection Kit’s USB adapter, essentially breaking compatibility with some cameras and other devices, according to a new report. 9 to 5 Mac claims that Apple has reduced the maximum amount of power that the iPad’s 30-pin connector can emit from 100mA to 20mA, leaving many non self-powered devices, including keyboards, microphones, flash drives, and some cameras unable to connect.…