Good morning OTAP! Over the weekend my mom called me to say she found a camera lens at a yard sale in Montana. She went out there with my step dad to visit my brother after hitting up Sturgis. She found a canon mount Sigma APO 170-500mm DG lens at a yard sale. They originally wanted $200 but my mom haggled them down to $150. I'm hoping it's a somewhat decent lens but for $150 can't complain. My mom said it looks like it has never been used. Is this lens any good? http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3276&navigator=3 Cliffs: Mom found a Sigma APO 170-500mm DG lens at a yard sale in Montana for $150.