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Hi Mark and welcome to the group.
I recommend giving those E-bay binos the flick pass and buying something 1/2 decent. Actually forget about buying astronomy equipment from E-Bay period. There are no such things as Bak-7 prisms, you get BK-7 or Bak-4, with Bak-4 being much more desirable as these prisms have a higher light transmittance across a wider refractive angle through the prisms.
With the cost of medium quality binoculars becoming more reasonable all the time you can get a pair of mid level binos in the 8x40, 10x50 to 12x50 class for between $200 and $300. Such brands include the Pentax PCF WP and Nikon Action Extreme. These Binos are fully multi coated and both use Bak-4 prisms. They are also porro prism design which in cheaper binoculars are better than roof prisms. Expensive roof prism binoculars are very good but you need to spend >$1,000 to get good roof prism binoculars which use phase coated prisms and have the same high light transmission as porro prisms which is necessary for night time astronomical viewing.
CS-John B
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