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James, I'd go for 10 X 50's if you want to hand-hold the binoculars . Unless you are young and have a very dark sky , the image brighteness will be about the same as 11 X 70's anyway as your pupil will stop down the 70mm aperture to more like 50mm.
On a tripod the 15 X 70's will be way superior due to being able to utilise the full 70mm aperture and having the extra magnification which will provide better contrast and resolution in star clusters and double stars etc.
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