Developed by Skywatcher for the serious astrophotographer. Optimized for Evostar-120ED Pro telescope, 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 to the corners. To connect you need the camera adapters of M48x0.75 to your camera Canon or Nikon (Prod. Code 20237 & 20238) Scope of delivery: Focal length reducer / corrector dust caps telescope not included! ! Power supply and batteries are not included!