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I agree with Chris, you are going to gain very little with either the ultima or pentax .
Probably the easiest thing to do rather than dew heating is to make some dew shields from poly pipe which is painted black & or flocked.{a 3-4 inches}.you just have to find some pipe which is close to the outer diameter of the binos..line the end of the pipe with black felt or velcro to help it hold
If you are not worried about the coatings - on the cheapest pair of your two binos you could apply a coating of anti-fog (sold by auto retailers) - i did it on a real cheap pair once & it helped stop dew forming. (WARNING IT COULD DAMAGE THE COATINGS) - for
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