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rookie
sage
Reged: 01/14/06
Posts: 332
Loc: St. Petersburg, FL
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Re: How should one check a binos performance
05/10/08 02:56 PM
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Hi Charles,
You can simply see how well your binoculars focus. If you are not sure how to do that properly, there is a thread for achieving correct focus in the under the subject heading: "Best of Binocular forum"
Use a bright star as a target. Go out tonight soon after it gets dark and look a little more than half way up from the eastern horizon. You should see a bright star (Arcturus). In your binculars it should look yellow or amber and focus to a single point of light. Then go south to another bright star (Spica). It should look pure white. Look at the moon. Study the terminator line that separates the sun's reflection from the shadow to see if you can see any details of mountains and craters.
The ablity to focus and discern star color are good starting points.
There are so many levels of optical quality, but with just about any binocular, you'll see much more in the sky than you can with your own eyes. Enjoy! 
--------------------
Shirley
Celestron CPC 800XLT~Feather Touch
G0 BT80~45degree; Fujinon 16x70 FMT-SX
Celestron Ultima 9x63 & Regal LX 10x42
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