I have heard this about the XWs over and over again. I since wondered how the TV Delos stack up against them.
Many reports have it that it's a wash between the Pentax XW and Delos. I've traded my XW-7mm for a Delos 6mm and couldn't be any happier with the Delos. From my recollection of the XW's performance, both EP's were equally excellent but to my eyes the Delos was less prone to beaning with eyecups fully retracted. There is probably more leeway for head room movements in the Delos before triggering the bean as compared to the XW, but that's just my opinion.
If one owns a Pentax, keep it. But how about those who are deciding between the Pentax & Delos? My take is go for the Delos, the state-of-the-art in EP design and implementation to date with the most modern coatings from one of the best EP co. around (TeleVue).
On a side-note, one deep sky observer who is well-regarded in the forum has the Delos besting the Pentax in detecting faint objects on the big scopes, click here
(w/graph) to view forum posts.
With regards to the best planetary EPs and still made today, here's my list (and the one's I currently own):
- Baader Classic Orthos (BCO)
- TV plossls
- Nagler T6
- University Optics HD (very recently re-introduced)