aerius is trolling. The compact prime is product meant for the motion picture industry, that they adapted to fit Canon (and Nikon) DSLRs. It sits somewhere between the novelty/collector's toy of a Noctilux (as ) and an esoteric professional tool. It's rated in transmission stops and marked in feet for a focus puller. It's main claim to fame is that it has full frame coverage, so it can be used to shoot video with a 5DII. TBH, that is its intended market: professional production companies who are shooting a scene (or a feature) with the 5DII.