Single scopes or spotting scopes, for example, are often used for hunting and bird watching. Since these binoculars will be used outdoors, possibly in rough terrain, it is important to look for a pair which is built to last and stand up to the odd fall or scrape.
They are suitable for a number of activities and adventures including bird watching, hiking, fishing, sporting events, stargazing, concerts, and nature observation. Monoculars permits the use of only one eye to view the articles which causes some problems. Compact binoculars have a very small objective lens, and this feature makes them user friendly.
The second number tells the size of the lens. Another feature to consider are the lens caps. Compacts have objective lenses 25 mm or less.
Looking at the moon on occasion with a telescope looks like snow has dropped on the surface of the moon. If you get the waterproof housing will pay for itself again and again. 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.
There is much more to astronomy then buying a telescope. Ideally, you are going to lug these babies around for 10 or 20 years, so get a good pair.
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