Up for sale is my excellent Sigma APO 50-500mm F4-6.3 EX DG HSM lens for canon mount. It's one year old. I used this lens very little (15 times max) and got Canon 600IS. Since then, the lens is in my closet most of the time. Asking price: $850 shipped.
Retail for this price @ $1550
Picture of the lens and sample picture here:http://www.aphanphoto.com/gallery/thumbnails.php?album=21