Developed by Skywatcher for the serious astrophotographer. Optimized for Evostar-80ED Pro telescopes, this high-quality optical accessory reduces the focal length of the telescope by a factor of 0.85x and offers improved field correction 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 cap Telescope not included! !Power supply and batteries are not included!