Optolong L1 Dual Combo Set with L-Quad & L-Para 2" Filters - L1SET-2

The Optolong L1 Dual Combo Filter Set includes an L-QUAD Enhance Broadband Filter and an L-Para Dual (OIII & Ha) 10nm Filter, both in 2" threaded aluminum cells.  Together these two filters produce amazing results, with dampening of light pollution, increased contrast, color optimization and precise signal capture!

Horsehead & Flame Nebula by Gianni Lacroce

About the L-Quad Broadband Enhance Filter...

The Optolong L-Quad filter provides better color balance while offering excellent light pollution resistance. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving contrast and detail to render subjects more vivid and three-dimensional. 

About the L-Para Dual 10nm Narrowband Filter...

In systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, with excellent contrast and Anti-Halo characteristics. This Optolong narrowband filter is suitable for all telescope systems and is adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard/normal focal ratio telescopes. Ideal for capturing Hα & OIII signals in celestial objects, this filter enhances image contrast and reveals richer details in Hα & OIII emissions.

Broadband - Narrowband Synergy

Using the qualities of both of the filters that make up the L1 Combo Set produces a “Broadband + Narrowband” synergy that has been engineered for precision and colour fidelity that achieves precise signal capture and color optimization for astrophotography:

1. The Quad bandpass broadband filter captures the RGB signals of celestial targets 

2. The L-Para Dual narrowband 10nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionized gas in deep-sky objects. After post-processing, photographers can effortlessly obtain fused images combining RGB with Hα & OIII data.

This "Broadband-Narrowband Synergy" solution delivers more vibrant color rendition while accentuating subtle signal details, unlocking innovative approaches for astrophotography and enhancing the creative possibilities of color camera imaging. It pioneers new artistic dimensions, transforming the deep-sky photography process into a more technically engaging and visually rewarding experience.

Coating Technology

• Multi-layers anti-reflection coating

• Non-cementing optical substrate coating

• Optolong 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 to ensure high value on transmission of pass-band as well as the optical density of off-band.