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Thanks Rod. Yes, I should have explained that the figures I gave were only really applicable to almost perfect seeing conditions.
Even though 2.6mm gives the maximum practical magnification, that's unlikely to be usable.
Even half that magnification ... a 5mm eyepiece ... could be stretching things much of the time.
Perhaps a suggestion would be to invest in a good 10mm eyepiece as Rod suggests and complement that with a decent 2X Barlow ... then if conditions are excellent you can use the Barlow and the 10mm to give you 5mm.
Remember that investing in good eyepieces is just that ... an investment. A nice Barlow and a good 10mm eyepiece are likely to stay with you even if your telescope changes in the future.
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