When I was doing some research into these binos there was a view that the 10x42 L IS WP was the jewel in the crown due to its improved optics and well matched stabilization. However, I went for the 15x50 IS since I wanted a bit more magnification. I had tried both mag types (10x50, 15x50) with conventional binos in the night sky to get an idea what the FOV and mag would look like, and decided the higher magnification was what I wanted to see more detail on the Moon, etc. I've read the image stabilization struggles a bit more with the 18x50 IS, and the exit pupil is smaller, but they are the same price as the 15x50 IS so its a difficult decision since the higher mag would bring out more detail.
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