Welcome to Astronomy & Telescope Astronomy

 
 

  Modules

· Home
· AvantGo
· Content
· Downloads
· Encyclopedia
· FAQ
· Feedback
· Forums
· Journal
· Members List
· Private Messages
· Recommend Us
· Reviews
· Search
· Statistics
· Stories Archive
· Submit News
· Surveys
· Top 10
· Topics
· Web Links
· Your Account
 

  Who's Online

There are currently, 8 guest(s) and 0 member(s) that are online.

You are Anonymous user. You can register for free by clicking here
 

  Search



 

  Languages

Select Interface Language:

 

  Random Headlines


Moon History
[ Moon History ]

·Astronomy: Moon History - A QUIET WORLD
·Astronomy: Moon History - LIQUID ROCK
·Astronomy: Moon History - IMPACTS, CRATERS, AND BASINS
 

 
  Binoculars: Astronomy: Binoculars - Test-IN-STORE TESTS
Posted on Monday, November 29 @ 02:27:02 CST by astronomy
 
 
  Binoculars

IN-STORE TESTS

Try before you buy is a good rule with binoculars. When comparing the models available, carry out these simple tests.



  • Do the images look sharp in the center? At what point do the images start to fuzz toward the edge of the field? Better models exhibit less edge distortion.
  • Hold the binoculars at a distance. Look down the eyepieces. The circles of light should be evenly illuminated. Dark squared-off edges are a.sign of the lower-quality BK7 prisms.
  • Look into the main lenses. Lots of white reflections indicate poorly coated optics, while dark lenses with a few deep purple or green reflections indicate high-quality multi-coated optics;
  • Are the binoculars comfortable to hold? Can you see the entire field without, pressing your eyes right up to the eyepieces?
  • Pass your hand across the front lenses so you look through just one side of the binoculars and then the other. Does the image jump back and forth? If so, the binoculars are "cross-eyed," or out of collimation—a serious defect.
 
 
  Login

Nickname

Password

Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.
 

  Related Links

· More about Binoculars
· News by astronomy


Most read story about Binoculars:
Astronomy: Binoculars - THE BEST BINOCULARS

 

  Article Rating

Average Score: 0
Votes: 0

Please take a second and vote for this article:

Excellent
Very Good
Good
Regular
Bad

 

  Options


 Printer Friendly Printer Friendly

 Send to a Friend Send to a Friend

 

 
 
Associated Topics

Binoculars
 
 


 
 
"Login" | Login/Create an Account | 0 comments
The comments are owned by the poster. We aren't responsible for their content.
 
 


 
 
No Comments Allowed for Anonymous, please register
 
 


 
  Astronomy & Telescope Astronomy

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest © 2004 by Astronomy & Telescope Astronomy
You can syndicate our news using the file backend.php or ultramode.txt