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My view on eyepieces for unguided dobs is to get a couple of wide angle 68 degree low and mid range eyepieces (say a 30mm, and a 20mm), a ultra wide at about 12mm and a good barlow (Orion Shorty Plus). That way you don't have to keep bumping the scope quite as much.
If they are too expensive then some good plossls (Teleview or equivilant) are great as they are good to the edge of the image which effectively gives you a "wide angle" lense compared to the cheaper eyepieces. Of course you would still need the barlow to effectively double the number of eyepieces.
Another point is to not get any double ups. In the above selection the 30mm will become a 15mm, the 20mm will become a 10mm and the 12mm will become a 6mm. That way you are not spending money on "eyepieces" you will not use.
Just some thoughts.
Cheers
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