Well I bought the gun, a Browning X-Bolt 270WSM. Now it is time to buy a scope. My other 2 rifles have a 20 year old 3-9 compact Leupold and a 3-9 Nikon BDC so I've never owned a good scope. I am down to 3 scopes to buy: Leupold VX-3 4.5-14x40, Vortex Viper HS 4-16x44, or the Zeiss Conquest 4.5-14x44 SF MC. The Vortex is $500 and the other 2 are $600ish. Does anyone know what the SF stands for in the Zeiss scope? What would you pick?