Bird watching binoculars need to be good in all light conditions, from dawn to dusk, and even have limited night vision. Astronomy stores are accustomed to dealing with the confused beginner though of course not everybody has the opportunity to visit a specialist store.
Consequently, spotting scopes are not only for the elite, but are becoming both essential and accessible equipment for the avid birder. The first is the number of times magnification, and the second is the diameter of the objective lens. If it just for the kids to play, then go with a less expensive model that they will not break easily.
Many viewers using prescription glasses do not need them to see through most telescopes and can see more comfortably by taking off their glasses. Most binocular lens protectors are replaceable. There are fine and intricate layers of chemical coatings on the surfaces of binoculars lens.
If you are still in your twenties you can probably use all of that 7mm exit pupil above as your pupils will dilate to about that size in very dark conditions, however as you get older your pupil does not dilate more than about 4 to 5 mm so large exit pupils are wasted. A good warranty is your ticket to trouble free repair.
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