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Hi Rod,
I have both and from my personal experience I find both to be ok. I can observe with and without glasses.
Both have an ER of 20mm and remember that both have adjustable eye cups/guards.
Without going into details, (which are covered extensively here on IIS and other sites), you really can't go wrong with either.
I am in no way a Televue over Pentax supporter (or vice versa) but personally I have a slight preference for the Delos but this is more subjective than technical. I just feel that the Delos puts up a more pleasing view and a fraction easier/forgiving.
For the purpose you state perhaps your main consideration may actually be construction, weight and bulk. The Pentax is a little smaller (height) and lighter and is made with more "weather proof" materials.
Hope this helps
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