I use the Pan 35 in a 12inch f/5 Dob and find it sooooo nice to use.
Personally I find the Panoptics 'easier' that the Nags, just more comfortable on the eye. I've never had issues with shadowing (seeing the secondary) with this combo either, but do with a 40mm eyepiece I have, I'd expect 35-36mm is about the limit.
Cheers,
Jason.
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