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I tried the 31mm Nagler against the 35mm Pan last weekend - have to say that the FOV was similar between the two, the 31 was more contrasty too. Somehow though, the pan was oddly more comfortable over the long haul... There's just too much to see in the 31mm with that spacewalk thing - it's like with the pan it's all there without having to look around for stuff!
Not tried the Pentax I'm afraid but is the 31mm worth the difference between it and the 35mm pan? I'd say yes, definitely, if only for the improved contrast (this may be because of the higher mag but I think not)
So, my point? If you want the extra FOV that you would get from the 31mm and if you spend lots of eyetime at the scope then go for the 35mm Pan - your eyes will thank you for it.
Arthur
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