SKYWATCHER 100ED 0.85X FOCAL REDUCER/FLATTENER0. 85x Focal Reducer Corrector for ED100 Refractor Designed for serious Astro Imagers. Optimized for the Sky Watcher BLACK DIAMOND and EvoStar ED100, 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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