- Express delivery within the EU
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 designed for color Astronomy cameras. 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.
Optolong 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.
The 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.
Key Features:
- 2" low-profile filter holder suitable for filter drawers and filter wheels - with M48x0.75 filter thread.
- The filter has a very narrow bandwidth of only 7 nm at O-III and S-II and ensures very high contrast.
- Suitable for telescopes from F3.3 and slower.
- Areas of light pollution are completely blocked, making successful deep-sky photography possible even near cities.
- Best possible anti-reflection coating to prevent halos around stars.
- The filter is suitable for mono and color cameras.
- Delivered in sturdy plastic packaging.
Spec:
- Filter size: 2" mounted
- Mount height: 5mm without external thread, 7mm with M48 thread
- Substrate: High-quality optical glass (Schott)
- Surface: Finely polished
- Filter type: Dual bandpass filter
- Transmission ranges: O-III and S-II - 7 nm bandwidth
- Filter thickness: 2mm
Whats included:
- Optolong 2" L-Synergy Filter
- Protective box, foam lined
REPUBLIC OF IRELAND
Est. Delivery Time:
5 - 10 Working days after dispatch
Standard Tracked Delivery:
Republic of Ireland Nationwide: from €8.95 upwards
Note: The exact shipping charge will depend on the size of your order and will be calculated at the checkout. Some large and bulky Telescopes may also be shipped to you directly from our Manufacturer. This is a special agreement we have with our suppliers to ensure our customers enjoy the cheapest possible shipping rates for large bulky Telescopes.
For some large Telescopes & orders, it may require special handling instructions and in this case you will be asked at the checkout to contact us for a special delivery quotation.
Mainland EUROPE (EU)
Est. Delivery Time:
3 - 5 Working days after dispatch
Standard Tracked Delivery:
Mainland Europe: from €4.95 upwards
Note: The exact shipping charge will depend on the size of your order and will be calculated at the checkout. Some large and bulky Telescopes may also be shipped to you directly from our Manufacturer. This is a special agreement we have with our suppliers to ensure our customers enjoy the cheapest possible shipping rates for large bulky Telescopes.
For some large Telescopes or orders, it may require special handling instructions and in this case you will be asked at the checkout to contact us for a special delivery quotation.
EU Additional Info:
If your country is not listed below please contact us for a specialised quote.
Standard EU Delivery Regions:
Germany, France, Belgium, Poland, Luxembourg, Netherlands, Denmark, Portugal, Spain, Austria, Italy, Poland, Croatia, Malta, Greece, Monaco Norway, Sweden & Switzerland.
NON EU Regions
Est. Delivery Time:
7 - 14 Working days after dispatch
Standard Tracked Delivery:
Non-EU: from €8.95 upwards
Note: The exact shipping charge will depend on the size of your order and will be calculated at the checkout. Some large and bulky Telescopes may also be shipped to you directly from our Manufacturer. This is a special agreement we have with our suppliers to ensure our customers enjoy the cheapest possible shipping rates for large bulky Telescopes.
For some large Telescopes or orders, it may require special handling instructions and you will be asked at the checkout to contact us for a special delivery quotation.
Standard NON-EU Delivery Regions:
United Kingdom, Switzerland & Norway
Note: For Non-EU countries, in some cases additional Tax or Customs Duty fees may apply on delivery. Unfortunately this is outside of our control and this varies between different regions. For questions about Customs & Import fees or to find out if they apply in your region, please refer to your local Tax office for more information.
IMPORTANT: It is essential when placing an order, that you include a valid 'Contact Telephone Number' for the delivery address or for the person receiving the item. This is necessary to avoid potential delays, return delivery costs or problems with your delivery.
Shipping Disclaimer: All of our parcels are sent via a 3rd party registered courier service to ensure safe and prompt delivery. While we endeavor to ensure that all parcels are delivered within the specified time frame, 'Horizon Astronomy' can not be held responsible for delays due to adverse weather conditions or other courier/technical related issues outside of our control.