Developed by Skywatcher for the serious astrophotographer. Optimized for Evostar 150ED telescopes, this high-quality optical accessory reduces the focal length of the telescope by a factor of 0.85x and offers improved correction of the field right into the corners. To connect you need the camera adapter from M48x0.75 to your Canon or Nikon camera (Prod. Code 20237 & 20238) Scope of delivery: Focal length reducer / corrector Dust caps! Power supply and batteries are not included in the scope of delivery!