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A 7mm xw i think would be a great planetary ep in that scope giving 214x.
You need to find out whats important to you and what you dont mind sacrificing. Do you want generous eye relief or generous field? Is 70 degrees with comfort enough, or is it worth sacrificing a little comfort for some extra field? Nobody on a forum can answer that question for you.
I probably wouldnt suggest mixing short and long ER eyepieces like nagler type 5/6's and pentax xw's. I have a range of pentaxs and a 24mm panoptic and the shorter ER makes the pano the odd one out and it feels cramped to me.
I would choose either a 13mm or a 10, but not both as they perform a similar role as a dso workhorse. If working with three eyepieces I would choose one 20-30mm, one 10-13mm and a 7mm pentax xw/xl for planetary/lunar/high power.
Another good choice in a 13mm is a Vixen LVW
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