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For years I've used 11 x 70 (cheaper Chinese made) and 7 x 50 (expensive Zeiss). I enjoy the extra light and magnification from the larger binos but the field of view is limited, the edge of field performance not great and holding them still is difficult. No way would I consider 15x magnification for hand held use. I've recently bought a mid price pair - Nikon Action EX 10x50 and find them to to be an excellent compromise for astro use in terms of weight, magnification and optical quality. They have long eye relief and an unusually wide field of view for a 10x magnification (6 degrees). Highly recommended.
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