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


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.



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