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rob is right about the fov..if you divide 122m/17.5 = ~7 deg FOV.
the 15x70 ultras are very good binos & worth the money - a tripod is a must. if you unsure though the 15x70 basics at andrews would probably be identical to the aoe 15x70 for $149 (same price)
10x50 & 15x70 are very different binocular items - the 10x50 give wide views for scanning the sky- hand held. The 15x70 should be mounted & i use for lookig at specific clusters or dso's
you should decide what you want to use them for
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