what do you guys know about them? how is the quality etc?
im deciding whether to get a d90 with a sigma 18-200 and i already have a 50-250 so i could sell that lens. OR a 60d body then buy a lens seperate but i wouldnt have much of any money to buy a lens but ebay is tossing a few cheap ones out so idk, but i was looking and SIGMA lenses (newer ones obv) are cheaper in most cases than stock nikkor/nikon lenses? is this just cause the nikon lens are OEM or are they better than sigma?
+k for help