Skywatcher Explorer-150PDS (OTA) Parabolic Newtonian Reflector incorporates the same superb mirror-set as the Explorer-150P Black Diamond Series, but with two significant advantages. A Dual-Speed 10:1 ratio focuser feature an excellent focusing precision. Also the tube length has been slightly shortened to optimise performance for prime-focus photography. Even better performance for astro-photography and visual use can be achieved when used in combination with Sky-Watcher’s Newtonian coma corrector. Also features high quality parabolic primary mirrors to eliminate spherical aberrations inherent in 'fast' focal length reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, constrasty images, which are full of detail. Features: Skywatcher Explorer-150PDS (OTA) Parabolic Dual-Speed Newtonian Reflector Telescope  6x30 Finderscope  Parabolic Primary Mirror  0.5mm Ultra-Thin Secondary Mirror Supports  2" (50.8mm) Dual-Speed 10:1 Crayford Focuser  33% more Light-Gathering than 130mm  Optimized For Prime Focus Astro-Photography  Shortened Tube Length for Optimized Performance  EQ3-2 Equatorial Mount with Aluminium Tripod Specification: Skywatcher Explorer-150PDS (OTA) Parabolic Dual-Speed Newtonian Reflector Telescope  Manufactured: Skywatcher  Magnification (with eyepiece Supplied): x30  Highest Practical Power (Potential): x300  Diameter of Primary Mirror: 150mm  Eyepieces Supplied (1.25"/31.7mm): 25mm  Telescope Focal Length: 750mm (f/5) Kit Contents: Skywatcher Explorer-150PDS (OTA) Parabolic Dual-Speed Newtonian Reflector Telescope 6x30 Finderscope 25mm (1.25"/31.7mm) Eyepiece User Operating Instructions Manual Manufacturers Warranty