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Pentax eyepieces are a near consensus choice amongst serious amateur and professional astronomers as the best that's out there, quite an accomplishment indeed given the fervent passion of the collective.
Pentax eyepieces are JIS Class 4 waterproof, rather impressive particularly given the fact that this includes their zoom model.
The XW line represents an even further improvement upon the venerable XL series. The apparent field of view has been expanded to a whopping 70°, but remarkably this was achieved without reducing their impressive eye relief of 20mm. There are eyepieces available with wider apparent viewing fields, but to take advantage of that wider field you'll have to be much closer to the eyepiece. This isn't exactly conducive to extended observing sessions. Additionally, there are lesser eyepieces with similar claims of 70° apparent viewing fields, but the performance upon the edge of these eyepieces isn't on par with the Pentaxes. If you're using a telescope with a fast aperture, this is of particular importance.
These are large and expensive eyepieces, but that's the price to pay for such an enviable combination of viewing field and eye relief. Buy the best once, and you'll still be enjoying the quality long after you've forgotten the price. Should you ever need to painfully part with your purchase, the best always has the most liquidity on the used market because they're rarely ever offered.
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