Just came across this in my lastest issue of Rangefinder mag. Pro-Optic Fish-Eye lens 8mm, 10 elements in 7 groups, built-in lens hood, and locking lens cap. Focuses down to 12", covers 180° field of view, aperture range from f/3.5 to f/22. Supports Canon, Nikon, Pentax and Sony/Minolta. $289.95 Thought is was worth sharing for those wantinig a fish-eye on the cheap. That's all I know, but you can research more if interested.