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For visual use, I have found that you usually end up using no more than 2 eyepieces 90% of the time. In my 12" dob, I had a 24mm Panoptic and a 13mm T6 Nagler. Had a bunch of other EPS that almost never left the box. On 2 separate occasions I acquired barlows, hardly ever used them and never satisfactorily.
In my 20" dob I now have a set of Ethos EPS (10,13,17 and 21). My 17mm is the EP i use maybe 90% of the time with very occasional use of the 21mm for big galaxy fields or the 13mm if a bit more power is needed for a small PN or galaxy. Very occasionally, the 10mm would come out. I had an 8mm but sold it as it just never got used.
To be honest, if I just had the 17mm I would still be perfectly happy.
Keep it simple!!
Malcolm
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