- Information about birding with Tele Vue telescopes, with telescope and accessory selection guides, specifications, reviews, usage notes, and dealer list.
- 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.
- Eagle Optics
- Resource for Binoculars and Spotting Scopes for Birding, Hunting, Nature, Sports, and Outdoor Recreation. See Complete Online Binocular Catalog and Buying Guide.
- Sells binoculars, scopes, and tripods. Includes reviews, articles on optics basics and a buying guide.
- WorldTwitch - Binoculars and Spotting Scopes for Birding
- Comparison of popular binoculars and telescopes used by birders, with recommendations.