All About Optics
   Advice about selecting optics for birding and reviews of binoculars and spotting scopes. Sponsored by Eagle Optics.
   http://www.allaboutoptics.com/

Audubon Society Guide to Binoculars
   Guide to buying binoculars from the National Audubon Society.
   http://www.audubon.org/bird/at_home/bird_watching/binoculars.shtml

Better View Desired
   Birding optics reviews, articles, manufacturers, and retailers.
   http://betterviewdesired.com/

Bird Watcher's Digest: OpticsFinder
   Collection of articles from the magazine on all aspects of buying binoculars and spotting scopes.
   http://www.birdwatchersdigest.com/optics/optics_index.html

BirdScope
   Information about birding with Tele Vue telescopes, with telescope and accessory selection guides, specifications, reviews, usage notes, and dealer list.
   http://www.televue.com/birdscope/

Birding Optics: Binoculars and Scopes
   Articles by Michael and Diane Porter on how to choose and use them, comparison charts of top brands, and how they work.
   http://www.birdwatching.com/optics.html

Eagle Optics
   Resource for Binoculars and Spotting Scopes for Birding, Hunting, Nature, Sports, and Outdoor Recreation. See Complete Online Binocular Catalog and Buying Guide.
   http://www.eagleoptics.com/

Mike's Birding Blog
   Reviews of optical equipment for birding and digiscoping. Articles and pictures about birding.
   http://www.birddigiscoping.com/blog.html

Optics4birding
   Sells binoculars, scopes, and tripods. Includes reviews, articles on optics basics and a buying guide.
   http://www.optics4birding.com/

WorldTwitch - Binoculars and Spotting Scopes for Birding
   Comparison of popular binoculars and telescopes used by birders, with recommendations.
   http://www.worldtwitch.com/optics.htm