You either know what this is or you don't. So I'm not going to bother giving you the details.
It's the lens that's shown here ..
www.0-360.com
Obviously mine is used, but I believe it was only used a few times .. if that.
On eBay these suckers are going for 300+, but none were really sold. Only one that was sold was at $150.
So make an offer from there ..
Will prob. post pics later.
Thanks.