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At f5 the XW absolutely trounces the panoptic. Imo its the best buy in its class of 70 degree eyepieces. At f10 it probably wouldnt matter.
The xw will cost more and imo its worth it unless you want to shell out for more field in a 31 nagler.
The nagler is good but suffers pincushion (or is it barrel) distortion, so panning around with it isnt the pleasant experience you get with a 30xw.
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