Hi John,
I've tried the 17.3mm Delos in my 10" F/4.7 and it is in dire need of a coma corrector BIG-TIME. I own the 17mm Vixen LVW, and while it also shows some coma, I can safely say that I am happy with it in my scope without a coma corrector.
The 17.3mm Delos starts to show coma about 50% of the way out. The 17mm Vixen LVW starts at around 75% of the way out, but it is not distracting at all. What I really like about the 17mm Vixen LVW is such easy eye placement, and excellent eye relief. The 17.3mm Delos however, does have a bit more "pop" to it and a really big "immersion" factor. If you own a coma corrector, I'd say to go with the 17.3mm Delos. If you do not own a coma corrector, you'd really like the 17mm Vixen LVW!
CS!
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