yeps.. both definitely overlap.. 18-70 at BnS is selling ard 200.. 16-85 Brand new is going for 950.. but both are really nice lens that can deliver... unless ders a need for VR and slightly wider + slightly longer.. else cant fork out the extra 700.. haha..
just nice the tamron 17-50 F2.8 sits in nicely between em though..
where is BnS btw? and y does the 18-70 and 16-85 has such a big price range different?