I would suspect that 8mm and 10 mm are so close that you wouldn't notice the difference. The 2X with the pentax would give you a nice high power set up. My personal experience is that 1 degree FOV is plenty for a wide field eyepiece.
Anyway, I'll be very interested to hear what other thoughts people have as there are many on this forum that have a much more extensive knowledge and experience with eyepieces than myself and I'm sure you'll get more opinions.
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