A goal of thunder !! While it costs a handsome sum of money, but a pebble like this is a concentrate of technology and know-how which have a price! This is a great investment for any enthusiast, AF OK, great dive, finally not too heavy on my 550d not therefore buying up collar with a barrel price is absurd. Macro, portrait anything goes! Delivery by amazing amazon, commissioned on February 8, received on 9 February at 13h 00 !!! Franck, happy owner of 100mm L series