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How do eyepiece adapters and focusers interact?


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Hello stargazers, I am using a Newtonian telescope (114mm/900mm) that has a 0.965" (24.5mm) focuser. My eyepieces are all 1.25" (31.8mm), so I use an adapter to make them fit. Yet, because the adapter adds distance between the eyepiece and the primary objective, does using an eyepiece adapter affect the way that my focuser works? Thank you for your advice.

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The eyepiece has to be a set distance away from the primary mirror. Because your adaptor adds length to the focuser, you will have to wind the focuser further inwards to "remove" this extra length. So long as your focuser has enough in travel for you to be able to focus your eyepieces, there will be no difference in how you use the focuser compared to using old 0.965" eyepieces.

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