Paper Date
Description / Bibliographic Information
US Patent # 5,646,781
Granted July 8, 1997
Inventor: Robert L. Johnson, Jr.
Related Filter Types
Article Blurb

This patent for a triple-bandpass coating is significant for its image enhancement capability. This coating transmits bands of pure color while eliminating the regions of “color confusion” while viewing by eye. Major markets include backyard astronomy, binoculars, gun sights, etc. Omega's tradename for this design is Spectraplus.