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I have both and have used them for over 2 years. In summary - they are both good binoculars. Both have their pros and cons. However - for purely astronomical use I would give the edge to the Ultras. They IMHO offer mildly superior optical and build qualities.
The Pentax does have a 50 degree Afov which can feel 'restrictive' at times - of course this is subjective. The Pentax does have Hi-quality FMC lens for good light transmission and internal secondary suppression. The image is sharp out to 90 %. It is a lighter bino as documented. Ergonomically it is easy to hand hold.
The Ultras are very well built and solid - this can be tiring. However the Afov of 65 degrees does give you more of that ‘Wow’ image. The view is more expansive and rewarding esp. when viewing star clouds from a dark site. Curvature of field occurs from about 80 %. Stars are absolute pin point on axis and light transmission and contrast are excellent and just exceeds the Pentax's. The Ultras are I.F.
You could not go wrong with both however the 10x50 Ultra’s would I believe be a more rewarding astro. bino with the caveat being they are heavier but not such a concern if mounting.
Chris
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