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"O"
Stay away from lower to mid priced roof prism binoculars which those Pentax roof prisms are. At almost $1,000 they sound expensive but for roof prism binos thats only mid level. Because of the internal design of roof prism binoculars the images are not as bright as porro prism binoculars, unless you buy the absolute top end roof prism binoculars from people like Leica, Zeiss, Nikon, Swarovski, Canon etc.
Regardless, I think you're better staying with a porro prism binocular because they cost a lot less to make hence buy and give brighter images which is important for night time observation. ie. A top shelf porro prism binocular will cost a lot less than a top shelf roof prism binocular.
A beginner may not pick all the advantages of an expensive binocular over a cheap binocular but most will be apparent given a little time. Generally with optics you get what you pay for and if you can afford a good pair of binoculars it is worth buying them IMO.
There are several excellent porro prism binoculars suitable for astronomy available in 10x50 size. I don't have time to post the links at the moment as I am about to leave for work but will amend this post later today with some links to some suitable higher end porro prism binoculars.
CS-John B
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