Astronomik

http://www.astronomik.com/english/enghome.html

Astro-Physics

http://www.astro-physics.com

Celestron

http://www.celestron.com

Cloudy nights telescope reviews

http://www.cloudynights.com

Coronado

http://www.coronadofilters.com

Kendrick Astro Instruments

http://www.kendrick-ai.com

Lumicon

http://www.lumicon.com

Meade

http://www.meade.com

Meade Advanced Products User Group.com

http://www.mapug-astronomy.net

The telescope review web site

http://www.scopereviews.com

Takahashi

http://www.takahashiamerica.com