Designed for serious Astro-Imagers. Optimised for the Evostar-72ED PRO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Supplied with thumbscrew fit adaptor. Use in conjunction with Sky-watcher’s M48 Canon or Nikon T-ring adaptors (product codes 20237 & 20238).