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0.85x Focal Reducer/Corrector for Sky-Watcher PRO 120 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher PRO 120 ED APO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction.
- 55mm back focus
- M48 threads (not standard T-thread)
- Drops ProED 120 from f/7.5 to f/6.3