{"product_id":"optolong-l-synergy-dual-narrowband-filter-2","title":"Optolong L-Synergy Dual Narrowband Filter - 2\"","description":"\u003cp\u003eThe core innovation of L-Synergy filters lies not in a single functional breakthrough, but rather in the precise combination of traditional dual-narrowband (Ha \u0026amp; OIII) technology—specifically designed for color Astronomy cameras. By adopting a dual-filter setup of \"Ha \u0026amp; OIII + SII \u0026amp; 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.\u003c\/p\u003e\n\u003cp\u003eThis solution delivers high-quality results with minimal investment, making professional-level narrowband imaging accessible to all.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eOptolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with an F-ratio of F3.3 or above (i.e slower systems）. Its key advantage lies in enabling astrophotographers to capture exceptionally detailed emission nebulae even in light-polluted environments.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eEven in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2\" low-profile filter holder suitable for filter drawers and filter wheels - with M48x0.75 filter thread.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe filter has a very narrow bandwidth of only 7 nm at O-III and S-II and ensures very high contrast.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSuitable for telescopes from F3.3 and slower.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAreas of light pollution are completely blocked, making successful deep-sky photography possible even near cities.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBest possible anti-reflection coating to prevent halos around stars.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe filter is suitable for mono and color cameras.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDelivered in sturdy plastic packaging.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpec:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilter size: 2\" mounted\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMount height: 5mm without external thread, 7mm with M48 thread\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSubstrate: High-quality optical glass (Schott)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSurface: Finely polished\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter type: Dual bandpass filter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTransmission ranges: O-III and S-II - 7 nm bandwidth\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter thickness: 2mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eOptolong 2\" L-Synergy Filter\u003c\/li\u003e\n\u003cli\u003eProtective box, foam lined\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":56206941389135,"sku":"L-Synergy2","price":307.39,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Optolong-Synergy_4.jpg?v=1761112189","url":"https:\/\/www.horizonastronomy.ie\/en-mt\/products\/optolong-l-synergy-dual-narrowband-filter-2","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}