I use a 17mm in my 12 inch Lx scope on steady nights and it fantastic. I use naglers and a panoptic for different focal lengths and these are just as good just different AFOV and magnifications,
You can not go wrong with any of the Televue eyepiece range, its night and day for clarity compared to th cheaper eyepieces.
Bang for buck, I would look at Naglers for your scopes while Aus dollar is high, the ethos 17mm is very heavy so it won't fit you ETX as its 2inch and may over balance your LB.
Then again in dark skies with an ethos on a well balanced LB would make for a nice very wide views. I love mine with the LX scope.
Regards Matt.
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