Lab test of contemporary high end 10mm eyepieces (use Google Translate if you don't read French):
NAV-SW--11/20 (NAV-HW not tested)
I have never used the Tak UW, but otherwise, I would have ranked them identically.
Nothing was 20/20, so there is room for improvement.
The summary scores are a bit misleading though, as every category got ranked and entered equally into the scoring, even though in some categories the differences would be visually imperceptible and in other categories the differences actually matter. Also note that both price and field of view entered into the scoring, which is maybe fair enough, but just looking at the scores without knowing that could be misleading. Finally, simple rank orders are not sensitive to how different things are between each step, e.g. is one extra degree AFOV really worth favoring one eyepiece over another? Is costing $21 more the same difference as costing $276 more? The price scores also do not reflect current US prices well, other than the Luminos being the cheapest.
The article wraps up with (butchered by google translate, and I don't fully agree given the considerations above):
"As in our previous test, the Televue Ethos is found in the leading duo. Without hesitation, this is the best choice for those looking for a wide field. But beware, he pays a heavy price. More surprisingly, the new Delos from the same brand comes out on top while its field is rather limited. It even dethrones the benchmark of the genre: the Pentax XW. If you are looking for performance above all else, this is the right choice. Let us also consider the Nikon NAV10-SW, whose reasonable weight and size make an attractive solution for telescopes sensitive to imbalance such as Dobsons. The two losers in the test are the disappointing Takahashi TAK10-UW for its price and the Celestron Luminos. This one occupies the last step. A defeat to be qualified, however: its performance is good on telescopes open at f / 7 and above, and its price remains attractive. It is therefore a solution to consider for Cassegrain telescopes."
To me, the Nikon stands out as the "winner" if the Ethos is too expensive or too heavy -- edge correction in fast scopes second only to the Ethos, weight light enough not to cause balance problems, and 72° AFOV is plenty for me (and barely different from the Delos, and Pentax, but they both score 2 points higher due to a 1% larger FOV).
Edited by Will_S, 13 August 2020 - 09:18 PM.