Here are some web locations that you may find interesting and useful . . .

• Optics Suppliers and Manufacturers
  JML Optical
  Newport Corporation
  Ross Optical (Rolyn Optics)
  Edmund Optics
  Newport Glass Works, Ltd
  Schott Glass Technologies
  IDEX Imaging and Illumination
  Apex Optical Services
  Davidson Optronics
  Universe Optics
   

• Professional Organizations & Publishers
  The International Society for Optics and Photonics (SPIE)
  Optical Society of America
  Astronomy Magazine
  Sky & Telescope 
   

• Optics, Astronomy & Telescope Making Resources
  The Astronomy Net
  AstroGoods.com
  Astromart New & Used Equipment
  Frank UK Photo-Optics 
  Telescopes.ru — Russian Optics
  Sky Scientific Surplus Optics and Books
  ​

• Astronomical Organizations and Groups
  San Jose Astronomical Association
  Riverside Telescope Makers Conference
  Golden State Star Party