D150F750 Newtonian Reflective Astronomical Telescope Professional 150750 Primary Mirror Group with Secondary Mirror Accessories \ Product parameters Type: Newton Reflector Spherical primary Mirror Material: high quality optical glass Primary mirror diameter: 150mm Primary mirror focal length: 750mm Primary mirror edge thickness: 18mm Surface: aluminum and protective foils suit for: reflection telescope Back: scrub / plane, random sent Secondary mirror axis: 34mm Secondary mirror Thickness: 8mm Features: Since the cost of the mirror is much lower than that of the lens, it is often a reflective, rather bulky, for large-diameter telescopes. Portable design of the telescope, although the tube is only 500mm, but the focal length can reach 1000mm. Newtonian mirrors have a coke ratio of up to f / 4 to f / 8, making them ideal for observing those weak alien galaxies and nebulae. Sometimes it is well suited to observe the moon and planets with this telescope. If you want to take pictures, use the Newton telescope is very good. But the use of anti-telescope than to break a little trouble. Newtonian structure can be a good convergence of light, in the focus to get a very bright like. Package List: 1set*Primary Mirror Objective Lens Group D150F750 Newtonian Reflective Astronomical Telescope Professional 150750 Primary Mirror Group with Secondary Mirror Accessories The pictures are for reference only, because of the environment and accessories and the final processing, the results presented are different from the pictures. Primary Mirror Sub Mirror Holder Secondary Mirror Base 3d Printing 150mm Primary Lens 35mm Secondary Lens Astronomical Telescope D150F750 cattle counter kit. Including: one-piece auxiliary mirror holder, auxiliary mirror holder, three-push and three-pull main mirror holder, main mirror pressure plate, and complete hardware. It is matched with 200*4mm PVC sewer pipe. Used for DIY150/750 cattle counter binoculars. The main mirror is not included in the kit.