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Geoff, there's a chap here in my hometown that has a Pentax 14mm. Can you tell me what it performs like in your 10 inch scope?, Is your 10" an f/5?...just curious to know how good the 14mm Pentax is because it has some negative field curvature.
Here is a page that shows it, looks like the 10mm and up shows positive field curvature and from when I looked through my 7mm Pentax XW , it was ultra-flat right to the extreme edge of the field stop without any lateral color at all.
I don't want to judge your 14mm XW on a chart alone, I just wondered how it performed in your telescope.
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Mark
12" Gso Scope
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