This is a .3x Ultra Fisheye adapter. It is the Century Precision Optics MKII. These are over $900 right now brand new. It has a bayonet style mount for a Canon GL1/GL2 or equivalent...(you do the research). I would like to get $350 obo and I will pick up the shipping within the U.S.
Thanks for Check'n it out.
-Cal
cal@4lockedfilms.com