For sweeping the sky, you need to gather as much light as possible. The 50mm aperture of either binocular is at the lower end of that scale. If you can get something with a larger aperture, do so. Also, binoculars in this price range tend not to be very sturdy. So if you drop them, there goes the alignment, which may render them useless for one eye.
The other consideration is eye relief, do you wear glasses? How about astigmatism? If you need to wear glasses, then you need longer eye relief to achieve prober focus.If you can get away without glasses while observing, then you can try something with less relief. For me I am nearsighted (one eye worse than the other) with mild astigmatism. I can get away with just about any sort of binocular, as long as I can reach focus.
Field of view is another thing to look at. And that could be a matter of personal choice. A narrow field let's you concentrate on the object you want to look at, but makes it harder to find. A wider field makes it easier to find stuff, but may also get lost in the wider expanse.
One optional thing to consider, that does make a huge difference, is holding the binoculars. If you can mount them on a tripod or some sort of holder and sit down to observe, you will have a more pleasurable experience. Then the binoculars stay in one place while you consult an observing guide or take a break.
Here's some other guides -
http://www.stargazing.net/david/binoculars/
http://www.cloudynights.com/item.php?item_id=1634
http://www.astronomy.com/Equipment/How-To/2004/07/Using%20binoculars.aspx
http://www.astronomybinoculars.com/category_s/232.htm
Ideas for mounting binoculars -
http://www.astunit.com/tonkinsastro/binoculars/binomount.htm
http://www.backyard-astro.com/equipment/skywindow.html
http://fesunoff.com/astro/binoMount.html
The other consideration is eye relief, do you wear glasses? How about astigmatism? If you need to wear glasses, then you need longer eye relief to achieve prober focus.If you can get away without glasses while observing, then you can try something with less relief. For me I am nearsighted (one eye worse than the other) with mild astigmatism. I can get away with just about any sort of binocular, as long as I can reach focus.
Field of view is another thing to look at. And that could be a matter of personal choice. A narrow field let's you concentrate on the object you want to look at, but makes it harder to find. A wider field makes it easier to find stuff, but may also get lost in the wider expanse.
One optional thing to consider, that does make a huge difference, is holding the binoculars. If you can mount them on a tripod or some sort of holder and sit down to observe, you will have a more pleasurable experience. Then the binoculars stay in one place while you consult an observing guide or take a break.
Here's some other guides -
http://www.stargazing.net/david/binoculars/
http://www.cloudynights.com/item.php?item_id=1634
http://www.astronomy.com/Equipment/How-To/2004/07/Using%20binoculars.aspx
http://www.astronomybinoculars.com/category_s/232.htm
Ideas for mounting binoculars -
http://www.astunit.com/tonkinsastro/binoculars/binomount.htm
http://www.backyard-astro.com/equipment/skywindow.html
http://fesunoff.com/astro/binoMount.html