Today the Chinese manufacturer Kipon announced that they will start selling their third party M-mount adapter for Fuji X-Pro1 cameras later this month (they will offer also Nikon and Contax versions). A DCHome forum member has posted several images (and samples) of the Kipon lens adapter. At the 2012 CES show Fujifilm confirmed that they will have their own M-mount adapter coming later in 2012.
