6" f/4 Imaging Newtonian telescope - for astro photography and rich field observation fast and diffraction limited reflector system (f/4) bright image by forced 94% mirror coatings good field illumination by 63mm secondary mirror robust mechanical system, no tilting/bending even under heavy camera load improved Monorail focuser with 1:10 dual speed transmission - more stability compared with Crayford designs  ideal for travelling: tube length only 58 cm, weight only 5.3 kgs with rings/no finderscope.   What's in the Box 150mm f/4 Newtonian optical tube assembly 2" Crayford-style linear bearing focuser with 1.25" eyepiece adapter 6x30mm straight-through finder with bracket and base Tube rings 8" Vixen-style dovetail rail 2" extension tube with 35mm extension Front dust cover No instruction manual is included   The high-quality 2" Crayford focuser The 2" Crayford focuser with 1:10 speed reduction is included. Accessories are evenly clamped with a brass compresssion ring. The 1.25" reducer is equipped with a brass ring, too. The focuser will not wobble even when used with heavy cameras. With the 1:10 speed reduction, precise focusing is possible. Point-shaped stars over the whole field are the result.