Optolong L-Synergy is a dual-narrowband filter (OIII-7nm & SII-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and SII (672.4nm) while blocking all other light-polluting emission lines. This ensures that only the signals from oxygen and sulfur elements are captured during imaging, resulting in a darker sky background and significantly enhanced contrast and signal-to-noise ratio (SNR) between nebulae. Even in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.
By adopting a dual-filter setup of "Ha & OIII + SII & OIII", it overcomes the inherent limitations of color cameras in narrowband astrophotography. With L-Synergy, users can achieve Hubble Palette-style deep-sky images comparable to those captured by monochrome SHO (SII/Ha/OIII) systems—without switching to a monochrome camera or purchasing additional SHO filters.
Dual 7 nm windows centered at OIII (~500.7 nm) and SII (~672.4 nm) for tight nebula contrast.
Durable coatings – multi-layer AR with ion-assisted deposition for stability and scratch resistance.
Format – 2″ mounted (M48×0.75); 1.85 mm optical glass substrate.