I'm thinking about a zoom tele lens for landscape and possibly for portrait. I guess I can live with manual focus to save some money. There are 3 Tamron lenses (used, with adapt-all mount) that look promising: 80-210 f/3.8-4 70-210 f/3.8-4 70-210 f/3.5 SP Does anyone have experience with these lenses? How good is the image quality of each one of them? How do they compare to Canon 75-300 f/4-5.6? Btw, my budget is $200. Thank you.