Tamron SP 15-30mm f/2.8 Di VC USD lens tested at DxOMark (Nikon F-mount) - Nikon Rumors
Used Tamron SP 15-30mm f/2.8 Di VC USD - Nikon Fit | MPB
Pentax HD D FA 15-30mm F2.8 ED SDM WR Review | PCMag
Amazon.com : Tamron AFA012N700 SP 15-30mm f/2.8 Di VC USD Wide-Angle Lens for Nikon F(FX) Cameras : Electronics
Amazon.com : NiSi S6 Main Adapter for Tamron SP 15-30mm f/2.8 G2 - Lens Adapter Ring for NiSi S6 150mm Filter Holder System - Attaches to 150mm Filter Frame, Holds S6 Circular