Skywatcher 72ED 0.85X FOCAL REDUCER/FLATTENERDesigned for serious Astro Imagers. Optimized for the Sky Watcher EvoStar ED72, this superb quality accessory effectively reduces the telescopes focal length by a factor of 0. 85x and provides much improved field edge correction. Use in conjunction with Sky watchers M48 Sony, Canon or Nikon T ring adaptors. Backfocus: 55mm
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