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for the close up view given you have a 650mm focal length, id recommend either a 4 or 5mm ep, this will give approx. 170x or 130x magnification [to be honest the 5mm would be my pick, it will be usable on more nights either with wind or adverse conditions]
what is your budget for an eyepiece?
id usually recommend a BST explorer, can be had for around $85, decent field of view & comfortable to look thru, can be had from telescopesastronomy.com.au in SA or online [also called astrotech paradigm]
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