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well hard to explain- the eye relief is quite large depending on the EP,s you use- but i notice the merge point is further away from the EP then using a single EP--youll reach focus one or another in the 80mm ED- you might need the 1.5X bino corrector, a 2xbarlow works- depending on your focuse travel you may just need an extension, a 2" diagonal even helps having a longer f/l over a 1.25-- in my SCT i need nothing to help reach focus, im my newt i need a barlow
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