Block, the slc 7x42 and 10x42 got swarobright prisms and lenses around 2002. The slc 8x30 got them in 2003. The pre swarobright slc had a dimmer, yellower view to them. The swarobright is more color nuetral, and brighter. Swarobright was dielectric prisms, and different coatings, not to be confused with swarovision, which are field flattening lenses. I dont know of anything in 2004, 2006 were the hydrophobic, or easy clean lenses. If the box says Swarobright on it, those are the better slc, up until the hd.