I finally decided to go with the Raynox HD-6600 for my GS-400 after reading all the info and comparing the examples at Ranynox. Now I need a hood. My first question is, does the hood screw on to the Raynox outer rings or somehow attach to the GS-400 and second is there one that is recommended by anyone? My last question is how do I attach filters with the Raynox lens and the hood attached? Thanks!