Got one of these this week:
https://photographylife.com/lenses/tamron-af-28-300mm-f3-5-6-3-xr-di-ld-aspherical-macroMine is an earlier model that lacks the Di labeling. I also have an earlier japanese version of this lens that was meant for SLRs.
http://www.photographyreview.com/cat/lenses/35mm-zoom/tamron/af28-300mm-f-3-5-6-3-ld-aspherical-if/prd_83613_3128crx.aspxThe newer lens is sharper and lighter weight. Just flat out better.