The Explore Scientific Hexafoc 2.5" Adapter for 3" Corrector is a ring which mates Hexafoc or Hexfocus-enabled telescopes - particularly the Explore Scientific range of Triplet Apo refracting telescopes, with the Explore Scientific 3" 0.7x Reducer/corrector.
This ring fits to the rear thread of the Hexfocus drawtube, once the 2" eyepiece holder with compression ring is removed and then provides a male thread for the Explore Scientific 3" 0.7x Reducer/corrector's 3" nosepiece internal to thread on to.
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The Explore Scientific 0.7x Reducer/corrector 3" reduces the effective focal length of a particular telescope by the factor 0.7x (for f/8) and 0.8x (for f/10) respectively.