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Well, whatever eyepieces you decide on, a good starting point for an 18" f/4.5 (assuming a Paracorr in the focuser) is a set:
30mm/15mm/10mm (+/- 1mm)
or, without a coma corrector (which I wouldn't recommend at f/4.5):
26mm/13mm/9mm
Then, add eyepieces in-between or above as needed, but at least you'd have "the basics".
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