... /7.5 2),lens:FMC 3),2"crayford focus 4),fully aluminum material detailed product description80600mm OTA refractor telescope1),aperture:80mm ... ,f/7.52),lens:FMC3),2" crayford focus4),fully aluminum of materialwhich include:1.2"single-speed focuser2.with ... dovetail3.fully metal CNC tube ring4.1.25"45degree correct image prism5 ...