The Optolong L2 Dual-Combo Set (Optolong, SKU: L2-Dual-Combo) includes two premium narrowband filters: L-eXtreme and L-Synergy. The set is designed for Deep Sky astrophotography with color cameras, enabling Hubble Palette imaging without the need for a monochrome camera or a full SHO filter set.

Key features

• set of two premium narrowband filters: L-eXtreme and L-Synergy
• L-eXtreme: dual narrowband O-III 7 nm and H-alpha 7 nm
• L-Synergy: dual narrowband O-III 7 nm and S-II 7 nm
• high transmission of key nebular emission lines: O-III, H-alpha and S-II
• effective blocking of other light pollution emission lines
• optimized suppression of bright star halos

Main use and performance

• designed for color camera astrophotographers
• enables Hubble Palette (SHO) imaging without switching to a monochrome camera
• compatible with optical systems as fast as F3.3 and slower
• enhanced flexibility for emission nebula imaging
• preserves the distinctive colors of O-III, H-alpha and S-II emissions while filtering most light pollution

Technical specifications

• set contents: L-eXtreme filter and L-Synergy filter
• L-eXtreme bandpasses: O-III 7 nm, H-alpha 7 nm
• L-Synergy bandpasses: O-III 7 nm, S-II 7 nm
• dual narrowband optical design
• multi-layer anti-reflection coatings
• ion-assisted deposition coating technology ensuring durability, scratch resistance and CWL stability independent of temperature changes
• planetary rotation system ensuring coating homogeneity, high pass-band transmission and high off-band optical density
• filter size: 2" (M48 × 0.75)