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Just received my 10mm XW today. No car available tonight so I spent an hour on my balcony with my 80mm ED scope surrounded by various blankets and towels to block out all the stray lights.
I don't have a 10mm Delos for comparison but I do have a 14mm Delos which I've used a couple of times. It does seem that Tele Vue have gone for a similar design to the XW, but they definitely haven't captured the Pentax comfort factor that John mentions above. My Pentax XL 21mm is the most comfortable eyepiece I've ever used, so much so that I've bought various other eyepieces over the years to replace it but always kept it in the end.
The 10mm XW feels very similar to my 21mm XL. Very easy on the eye. And it does seem to have a certain penetration even in my light-polluted location. I'm looking forward to getting out under a darkish sky.
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