Why do we make a L-Synergy filter?
The core innovation of L-Synergy filters lies not in a single functional breakthrough, but rather in the precise combination of traditional dual-narrowband (Ha & OIII) technology—specifically tailored for color camera users. 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.
This solution delivers high-quality results with minimal investment, making professional-level narrowband imaging accessible to all.
1. Optolong L-Synergy
Opotlong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments.
After years of technical refinement, it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.
Key Features:
Optolong L-Synergy's advantage lies in its selective transmission of only the nebula emission lines 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.
2.Optical Design
By analyzing the spectral characteristics of both celestial emission lines and light pollution, L-Synergy selectively preserves the SII and OIII nebula colors while filtering out the majority of light pollution. Specifically designed and optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands. This ensures users can precisely capture the target nebula emissions, delivering optimal astrophotography results.
How to read the chart?
- The horizontal axis is the Wavelength in Nanometers(nm).
- The vertical axis is transmission in %.
3. Coating Technology
- Multi-layers anti-reflection coating
- Non-cementing optical substrate coating
- Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.
- Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.
Scope of Delivery:
- Optolong L-Synergy dual-narrow band filter FWHM7nm
