Centered around Volkel Air Base in the Netherlands, the group offers information on aircraft movements, other such groups, the hobby, the magazine and membership.

Maker of cameras, microscopes, endoscopes, industrial scopes, printers, recorders, and binoculars.

Sells astronomical and terrestrial telescopes, binoculars, spotting scopes, microscopes, digital cameras, GPS equipment, range finders and accessories. Located in U.K.

Vendor of firearms accessories, including grips, scopes, stocks, and mounts.

Shop for rifle scopes, range finders, spotting scopes, binoculars, airguns, radios, and blackpowder products.

Offering insight by an Aircraft Dispatcher for a US Airline. Aircraft dispatch, aviation weather, flight simulator, aviation photography, aircraft spotting, and airline news.

Providing mobile cleaning system services for homes and businesses. Includes maintenance tips, FAQs, spotting guide, photos and contact information.

E-mail group for discussion of all matters related to digiscoping (use of digital camera in combination with a spotting scope for high-magnification photography).

Aviation photos and spotting information from Faro airport in south Portugal.

Cleans carpets and upholstery. Contains summary of services, spotting chart and online newsletter.

Night vision scopes, goggles, weapon sights and variety of day-time optics.

On-line shop offering beginner telescopes, rifle scopes and binoculars for bird watching and hunting. Located in the U.K.

Basic tips and links for photographing birds using a digital camera attached to a spotting scope.

Offers astronomical telescopes, Celestron spotting scopes, Pentax eyepieces, digital binoculars and a variety of accessories. Categorized product listing, specials and online ordering.…

Offers repair, cleaning and collimation services for binoculars, telescopes, rifle and spotting scopes. Specializes in repair of antique and military instruments.

Sells a wide range of binoculars including auto focus, night vision, zoom, standard and compact models. Also sells monoculars and rifle scopes. Located in California.

Developer of the ADR Manager, a comprehensive database system that tracks Automated Dialogue Replacement cues from spotting through the final mix.

Opticaspace.com carries binoculars, telescope, spotting scope, led lamp, and loose gemstones

Sells binoculars, scopes, and tripods. Includes reviews, articles on optics basics and a buying guide.

Humorous, ironic guide, describing train spotting culture, use of data books, collection of numbers for obscure rolling stock, gaining entry to depots, and railway journalism.