hello, i have an old pentax body (ME-F) and two lenses. i bought a vivitar 70-200mm lens about a year ago. my camera body is giving me trouble and i've taken it to several camera shops and they don't know what's wrong with it. anyway, i'm looking into buying another affordable camera body, perhaps a minolta maxxum 70. i'm wondering if my old lenses will work with this new body. does anyone have experience with the maxxum 70? is it considered pretty safe to buy used lenses/bodies online? any comments would be appreciated. thanks in advance.