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As 8 or 9 eyepieces may seem too many for some to hve in ones inventory, one could also pick one from each magnification group still appropriately spaced.
So for a f/5 scope.. it could be
Exit pupil --- 0.6 - 1.2 - 2.4 -- 4.8 - 6.8.
Focal Length --3 - --6 - -12 - -24 - -34.
3mm can archived by using a 2X barlow the others in between by using a 1.5X one.
Clear Skies!
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