Optolong L2 Dual-Combo 2" Set (L-Synergy + L-eXtreme)
When will I receive it?
Products marked In stock are dispatched promptly — the exact delivery estimate for your address is shown at checkout, before you confirm the order.
For international shipments, delivery times depend on the destination and are always displayed at checkout before payment.
Products marked Available on order require 5–15 business days for processing. Our team will keep you updated promptly if anything changes.
What are the warranty terms?
Shop with confidence: all our products include a 24-month legal warranty for conformity defects, managed directly by our team.
Many brands also offer extended warranty coverage beyond 24 months — contact us to find out the specific terms for the product you're interested in.
Click here for more information.
Can I return a product?
Yes: you have 14 days from delivery to return any product and receive a full refund — see our Refund Policy for full details.
Items must be returned in their original condition and packaging. Return shipping costs are the customer's responsibility.
Not sure which product is right for you? Contact us before buying — we'll help you find the perfect instrument so you won't need to return anything.
Sei un'azienda? Compila il modulo per la fatturazione
Clicca sul pulsante qui sotto per inserire i tuoi dati aziendali:
Vai al moduloOptolong L2 Dual-Combo 2" Filter Set (L-Synergy + L-eXtreme)
The Optolong L2 Dual-Combo 2" Filter Set is designed for astrophotographers using color cameras who want to achieve Hubble Palette (SHO)-style results without switching to a monochrome camera. The kit includes two high-performance filters:
- L-eXtreme (Ha 7nm + OIII 7nm) – selectively isolates the emission lines of Hydrogen-Alpha (656.3nm) and Oxygen III (500.7nm), effectively blocking light pollution.
- L-Synergy (SII 7nm + OIII 7nm) – captures Sulfur II (672.4nm) and Oxygen III (500.7nm) with precision, delivering clean, natural-looking images.
This innovative combination offers a simplified and affordable alternative to traditional narrowband imaging, enabling deep, detailed astrophotography even with fast optical systems down to f/3.3.
Main Benefits
- Perfect for Hubble Palette imaging with color cameras.
- Ideal for deep-sky astrophotography: emission nebulae, supernova remnants, and faint targets.
- Optimized to suppress star halos and gradients, even under full moon conditions.
- Provides maximum creative flexibility with less complexity and lower cost.
- Professional-grade performance: >85% transmission, 1.85mm optical glass, 60/40 surface quality.
Technical Specifications
| Included Filters | L-eXtreme (Ha-OIII), L-Synergy (SII-OIII) |
| Bandwidth (FWHM) | 7nm (Ha, OIII, SII) |
| Unwanted light blocking | 300–1050nm |
| Transmission | >85% |
| Thickness | 1.85 mm |
| Substrate | Polished optical glass (λ/4) |
| Surface Quality | 60/40 – Parallelism: 30'' |
Field Performance
Extensive tests confirm excellent performance even under full moon conditions. With integrations exceeding 20 hours, the L2 Dual-Combo delivers sharp images free from gradients or halos, with clearly separated SII and OIII channels. An ideal choice for astrophotographers who want to maximize the potential of their color camera while reducing workflow complexity and post-processing time.