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Since you're buying expensive wide field eyepieces you might also consider a paracorr. If you intend to purchase a paracorr this has an impact on which low/medium power eyepieces you select since it changes the effective focal ratio of the scope to 5.2(focal length 2100mm), thereby changing the magnification and exit pupil produced by each eyepiece. With a finder eyepiece for example, 30mm would be fine in the f/4.5 scope if it is used with the paracorr.
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