I disagree Shane. 7mm exit pupil is rarely utilised in practice and even then it comes at a price. It is more demanding on the optics which is why 7mm EP binos usually have a smaller apparent field of view compared with the usual 5mm. E.g. a 7x50 will have the same true field as a 10x50, but you will see more stars with the 10x50 because of the increased magnification. Provided you can hold a 10x bino steady enough it is a better choice. Then you might say why not go 10x70? Because it has a smaller field, it is heavier, and because your eyes will get older. So your pupil will generally be 5-6mm, not 7mm. Even if you're young 7mm pupils are achieved only under dark skies.
Having said all that I do like 7x50 binos. Good magnification for hand holding.
