Long range rifle scope turret quality, glass quality. lens origin, and brand names are all compared in this video. Rex explains the differences between chromatic, achromatic, and apochromatic lenses. What are ED lenses? How do HD lenses work? How are APO lenses put together? Where are these different lenses made? Does Leupold really get their glass from China? What do we want to look for in terms of scope quality. Rex explains it all and begins the process of reviewing the representative long range scope in each of the major brands. Barska and BSA scopes compared in this video. The illustrations and tables used in this video are now available at: http://postimage.org/gallery/bxlfasze/4e32d9e1/ All of the music, illustrations, tables, and photography in this film were created by TiborasaurusRex, an unsigned artist. Song Title: Particle Jam Created and performed by: TiborasaurusRex