Hey guys there's a few lenses I'm interested in that are for sale on Craigslist first is a canon 500mm 4.5L next is a canon 300mm f4L non is and last a new 16-35 2.8 version I. I'm most interested in the 500 but they all interest me for the right price. What's the value on these lenses? And I'm aware about them being older, but I am currently using a 20 year old 20-35 2.8 (which I love) and a 20+ year old 80-200 2.8(also love) thanks guys