When choosing a pair of binoculars, what factors should I consider?

The following factors are the most important in determining binocular performance:
  • Objective lens diameter
  • Magnification
  • Type and quality of the objective lens glass
  • Type of lens coatings
  • Type of prisms
 
In general, large objective lenses, low magnification, and fully multi-coated lenses are most desirable features for a high-performance binocular.
 
Updated 10/23/13