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perhaps you may like to mention focus type CF or IF.
I have always found IF are superior for astronomy, as once set to infinity they stay there! Also generally much more rugged construction. (I just bought a superb pair of Nikon 7x50IF on ebay for $24!)
Another item you may wish to cover is external galaxies that are easily visible in 7x50 binoculars. For southern (dark) skies I would rate these as Centaurus A, M87, NGC253.
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