6311 Includes Only: 6" Optical tube assembly 8x50 mm straight-through finder with bracket Tube mounting rings 8.7" Vixen-style dovetail rail 2" 35mm extension tube Front dust cover Features: Dual speed 2" Crayford-style focuser with 1.5" adapter iEAF ready BK7 optical glass ...6311 Includes Only: 6" Optical tube assembly 8x50 mm straight-through finder with bracket Tube mounting rings 8.7" Vixen-style dovetail rail 2" 35mm extension tube Front dust cover Features: Dual speed 2" Crayford-style focuser with 1.5" adapter iEAF ready BK7 optical glass primary mirror with a protective quartz layer 8 x50mm finder scope 8" Vixen style dovetail plate with solid full circumference mounting rings Front dust cap Optional iOptron iEAF Focuser iOptron's 150mm (approx. 6") f/4 Newtonian optical tube assembly (OTA) with a fast F/4 focal ratio is perfect for imaging deep-sky objects with a DSLR or dedicated astronomy camera. The 2" Crayford-style focuser, dual split-hinged mounting rings, an 8x50 straight-through finder, and an 8" Vixen style dovetail plate make it ready to attach to your mount and start using.