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Hi Haroon,
What are you intending to use them for and how ?
20 x 80 are huge binoculars, very heavy and will need a tripod or balance mount to be held for any length of time. I imagine they are pretty good nonetheless, Andrews has a good reputation to maintain.
Most people start with a pair of 10 x 50 or 12 x 50 binocs. They are big enough to be good for astro viewing but light enough to not require additional support. They will give good widefeild views but gather enough light to be able to show some brighter nebulae as small smudges.
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