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Though they don't crow about it, Pentax XW eyepieces are also waterproof.
The value in this would be felt, I would think, over time, because I have seen many older eyepieces with "haze" on the internal lens surfaces. We live in smoggy cities these days, and it coats our mirrors, our eyepieces, and our lungs.
Fortunately, the lungs are self-cleaning. Not so the interiors of eyepieces.
If it doesn't cost extra, there's no harm in it.
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