The upcoming Samsung S 300mm f/2.8 ED OIS NX lens is huge - Photo Rumors
Samsung NX300: Digital Photography Review
Samsung NX300 Mirrorless Digital Camera EV-NX300ZBAVUS B&H Photo
Amazon.com : 40.5mm Digital Pro Telephoto Lens Bundle for The Samsung NX300 with Samsung 20-50mm Lens. Includes 2X Telephoto High Definition Lens, Lens Pen Cleaner, Cap Keeper, UltraPro Deluxe Cleaning Kit :