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usually a cheap bino with anti-glare coating is not good for astronomy - as it reduces the light coming into the bino.
for $100 you should be able to get a FMC glass, check andrews site - look at theie marine grade 10x50 for 99, & the HG high grade 10x50 for $169, both are waterproof, with nitrogen so no internal fogging if using them in damp/dew conditions
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