A while back, while digging through boxes in the basement I came across my dad's old camera -- a Minolta SR-T 102 (circa mid '70s). I've since been trying my best to teach myself the basics of photography and am thoroughly enjoying it. I've really been wanting to get into macro photography and have been looking for lenses to buy. Made an impulse buy on ebay today and picked up a Minolta MC Macro Rokkor-QF f/3.5 50mm lens -- thought it was a good price so I jumped on it. I've since done some reading and seems like it might be better to go with something with a longer focal length for all around macro shots? Looking around more on eBay, I've noticed quite a few 70-210mm f/4.5 macro zoom lenses by Vivitar (Minolta MD mount) for what seems a ridiculously low price (i.e. here, here and here). How is the quality on these lenses? Looking to stay on a budget and just want something for occasional weekend photo ops. Thanks for the help!