I agree with John B ... 7mm is probably the lowest FL eyepiece you'll want for most conditions. I had a 5mm Nagler at one stage, but ended up selling and getting a 7mm William Optics UWA which gives much crisper views under normal viewing conditions.
BTW, a moon filter (ie. neutral density filter) is sometimes handy when viewing Jupiter which tends to be very bright.
Cheers,
Jeff
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