16" f/8 Advanced Coma Free Optics, 3251mm Focal Length, Borosilicate Glass Primary/Sec Mirrors, Star - Star II Go - Lock from Meade is a technologically advanced Cassegrain telescope with a computerized fork mount. This innovative ACF optical design combined with Meade's Ultra High Transmission Coating ensures that images are bright with high contrast and faithful color reproduction. - Meade engineers developed a new coma free design by combining a hyperbolic secondary mirror with a primary mirror and corrector lens that perform as a single hyperbolic element. The ACF design even eliminates diffraction spikes and improves astigmatism both of which are inherent in the traditional RC design. - At the core of the LX600 Series' tracking and alignment system is Meade's Star - Lock technology. - Unlike standard autoguiders Star - Lock directly transmits specific real-time commands to each of the servo motors resulting in enhanced accuracy and faster guide corrections to within one arcsecond. - The LX600 is packaged with a heavy-duty double-tine fork that is engineered to accommodate the optical tube assembly Star - Lock assembly and DSLRs used for astrophotography. 11 worm gears in both RA and DEC axes provide smooth movement with minimal periodic error. This fork enables 180 degree range of motion allowing the optical tube to slew from horizon to horizon without the meridian flip common with German equatorial mounts. AutoStar II Go - To software makes setting up and observing celestial bodies with the LX600 both user-friendly and relatively easy. Over 144 000 objects are pre-loaded on the Auto - Star handbox all stargazers need to do is enter the moon planet star cluster nebula or galaxy of their interest on the Auto - Star handbox and the mount will automatically move the telescope into alignment. - Lock combines world-class optics with a robust yet portable fork mount (and a portable tripod or permanent pier sold separately). Paired with the Auto - Star II Go - To software this kit includes all the hardware and software that professional astronomers and astrophotographers need for years of superb observation.