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Thanks Nick.
The reason I'm thinking of 10mm is that I have an 8mm, and as yet the seeing hasn't been up to this amount of magnification. I'm happy to buy a few different short f/l for those exceptional nights, but spending the $$ on a Delos I want to get something useable most of the time.
It's interesting that you say 13mm is a sweet spot. There's 14mm and 12mm in the Delos range. Maybe a good range of exit pupil would be 2.3mm, 1.6mm (24mm Pan), 0.8mm (12mm Delos)
I had a 13mm Nagler once that was wonderful...
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