Desc:BK7 /K9/JGS1/ sapphire Porro Prism for Telescope BinocularsPorro Prism is composed of one large face and two roof faces which are mutually vertical. B...
Desc:HalfPentaPrismPrecision OpticsPenta prism can deviate an incident beam without inverting or reversing to 90.The deviation angle of 90 is independent o...