Optolong L1 Dual Combo Filter Set with L-QEF & L-Para Filters - 2" Mounted
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- Dual-Filter Versatility for Enhanced Imaging
- L-Quad allows 90% transmission for key nebula lines (H-Beta, OIII, H-Alpha, SII)
- L-Para allows 85% transmission for richer details in Ha & OIII emissions
- For focal ratios of f/2 and above, ensuring contrast and haloing suppression
- Multi Coatings for brighter and more contrasted exposures
- 2" threaded filters for flexible and versatile Imaging
L1 Dual-Combo Set: Color and signal, now both perfected!
Ready to elevate your astrophotography? The Optolong L1 Dual Combo Filter Set combines two precision-engineered filters—the L-QUAD and L-Para—to help you capture the cosmos with exceptional clarity. Designed for 2" mounted setups, this dual filter set is tailored for deep-sky imaging, effectively isolating key emission lines while minimizing light pollution. Whether you're using a monochrome or color camera, these filters work in tandem to enhance contrast and detail in your images. With their high transmission rates and narrow bandwidths, they ensure that your captures are both vibrant and precise. Ideal for telescopes with a focal ratio of f/2 and above, this filter set is a valuable addition to any astrophotographer's toolkit!
Watch Gianni Lacroce’s 31-hour deep-space test with the L-Para and L-Quad filter set!
L-Quad Enhance Filter：
The Quad Bandpass Broadband Filter enhances color balance while reducing the impact of light pollution. With more than 90% transmission of the nebula emission lines at H‑Beta (486.1 nm), OIII (500.7 nm), H‑Alpha (656.3 nm), and SII (672.4 nm), making it ideal for a wide range of imaging targets! The best targets being broadband like nebulae, galaxies, and star clusters. By preserving the natural RGB color balance in broadband targets, this filter improves contrast and brings out finer details, rendering your subjects more vivid and three-dimensional.
L-Para Filter：
The L-Para Filter is a dual narrowband 10 nm filter designed to deliver exceptional contrast and clarity. In systems with focal ratios of f/2 and above, it transmits over 85% of key nebula emission lines, including Hα and OIII, while minimizing halo effects. Versatile and adaptable, it works beautifully with fast optics (f/2 to f/4) as well as standard telescopes. Perfect for capturing Hα and OIII signals in deep-sky objects, this filter enhances contrast and reveals richer, more detailed structures in your astrophotography.
Dual Filters Designed for Detail and Clarity
Both filters in the set are optimized for fast optical systems, with the L-Para maintaining over 85% transmittance for OIII and Ha emission lines, delivering excellent contrast and anti-halo performance. The L-QEF filter offers over 90% transmittance for key nebula lines (Hb, OIII, Ha, SII) while effectively suppressing light pollution, enhancing color balance and reducing background noise. Together, they provide crisp, vivid images even in challenging, light-polluted skies.
- L-Quad Enhance Filter: Quad bandpass broadband filter captures the RGB signals of celestial targets
- L-Para : Dual narrowband 10 nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionized gas in deep-sky objects.
L-Quad Enhance Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Type: Quad bandpass broadband filter
- Thickness: 1.85 mm
- Transmission: >90% at H-Beta (486.1 nm), OIII (500.7 nm), H-Alpha (656.3 nm), and SII (672.4 nm)
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
L-Para Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Thickness: 1.85 mm
- Type: Dual narrowband 10 nm filter
- Transmission: >85% at OIII and H-Alpha wavelengths in systems with focal ratios of f/2 and above
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 6.8 mm / 0.26 in
C = Filter Cell Height (Excluding Male Thread) = 4.8 mm / 0.18 in
M = Male Thread Length = 2.0 mm / 0.07 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 44 mm / 1.73 in
Other Information
- Country of Manufacture: China
L1 Dual-Combo Set: Color and signal, now both perfected!
Ready to elevate your astrophotography? The Optolong L1 Dual Combo Filter Set combines two precision-engineered filters—the L-QUAD and L-Para—to help you capture the cosmos with exceptional clarity. Designed for 2" mounted setups, this dual filter set is tailored for deep-sky imaging, effectively isolating key emission lines while minimizing light pollution. Whether you're using a monochrome or color camera, these filters work in tandem to enhance contrast and detail in your images. With their high transmission rates and narrow bandwidths, they ensure that your captures are both vibrant and precise. Ideal for telescopes with a focal ratio of f/2 and above, this filter set is a valuable addition to any astrophotographer's toolkit!
Watch Gianni Lacroce’s 31-hour deep-space test with the L-Para and L-Quad filter set!
L-Quad Enhance Filter：
The Quad Bandpass Broadband Filter enhances color balance while reducing the impact of light pollution. With more than 90% transmission of the nebula emission lines at H‑Beta (486.1 nm), OIII (500.7 nm), H‑Alpha (656.3 nm), and SII (672.4 nm), making it ideal for a wide range of imaging targets! The best targets being broadband like nebulae, galaxies, and star clusters. By preserving the natural RGB color balance in broadband targets, this filter improves contrast and brings out finer details, rendering your subjects more vivid and three-dimensional.
L-Para Filter：
The L-Para Filter is a dual narrowband 10 nm filter designed to deliver exceptional contrast and clarity. In systems with focal ratios of f/2 and above, it transmits over 85% of key nebula emission lines, including Hα and OIII, while minimizing halo effects. Versatile and adaptable, it works beautifully with fast optics (f/2 to f/4) as well as standard telescopes. Perfect for capturing Hα and OIII signals in deep-sky objects, this filter enhances contrast and reveals richer, more detailed structures in your astrophotography.
Dual Filters Designed for Detail and Clarity
Both filters in the set are optimized for fast optical systems, with the L-Para maintaining over 85% transmittance for OIII and Ha emission lines, delivering excellent contrast and anti-halo performance. The L-QEF filter offers over 90% transmittance for key nebula lines (Hb, OIII, Ha, SII) while effectively suppressing light pollution, enhancing color balance and reducing background noise. Together, they provide crisp, vivid images even in challenging, light-polluted skies.
- L-Quad Enhance Filter: Quad bandpass broadband filter captures the RGB signals of celestial targets
- L-Para : Dual narrowband 10 nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionized gas in deep-sky objects.
L-Quad Enhance Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Type: Quad bandpass broadband filter
- Thickness: 1.85 mm
- Transmission: >90% at H-Beta (486.1 nm), OIII (500.7 nm), H-Alpha (656.3 nm), and SII (672.4 nm)
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
L-Para Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Thickness: 1.85 mm
- Type: Dual narrowband 10 nm filter
- Transmission: >85% at OIII and H-Alpha wavelengths in systems with focal ratios of f/2 and above
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
- 1x L-Quad Enhance Filter
- 1x L-Para Filter
- Dust Cases
- Dual-Filter Versatility for Enhanced Imaging
- L-Quad allows 90% transmission for key nebula lines (H-Beta, OIII, H-Alpha, SII)
- L-Para allows 85% transmission for richer details in Ha & OIII emissions
- For focal ratios of f/2 and above, ensuring contrast and haloing suppression
- Multi Coatings for brighter and more contrasted exposures
- 2" threaded filters for flexible and versatile Imaging
L1 Dual-Combo Set: Color and signal, now both perfected!
Ready to elevate your astrophotography? The Optolong L1 Dual Combo Filter Set combines two precision-engineered filters—the L-QUAD and L-Para—to help you capture the cosmos with exceptional clarity. Designed for 2" mounted setups, this dual filter set is tailored for deep-sky imaging, effectively isolating key emission lines while minimizing light pollution. Whether you're using a monochrome or color camera, these filters work in tandem to enhance contrast and detail in your images. With their high transmission rates and narrow bandwidths, they ensure that your captures are both vibrant and precise. Ideal for telescopes with a focal ratio of f/2 and above, this filter set is a valuable addition to any astrophotographer's toolkit!
Watch Gianni Lacroce’s 31-hour deep-space test with the L-Para and L-Quad filter set!
L-Quad Enhance Filter：
The Quad Bandpass Broadband Filter enhances color balance while reducing the impact of light pollution. With more than 90% transmission of the nebula emission lines at H‑Beta (486.1 nm), OIII (500.7 nm), H‑Alpha (656.3 nm), and SII (672.4 nm), making it ideal for a wide range of imaging targets! The best targets being broadband like nebulae, galaxies, and star clusters. By preserving the natural RGB color balance in broadband targets, this filter improves contrast and brings out finer details, rendering your subjects more vivid and three-dimensional.
L-Para Filter：
The L-Para Filter is a dual narrowband 10 nm filter designed to deliver exceptional contrast and clarity. In systems with focal ratios of f/2 and above, it transmits over 85% of key nebula emission lines, including Hα and OIII, while minimizing halo effects. Versatile and adaptable, it works beautifully with fast optics (f/2 to f/4) as well as standard telescopes. Perfect for capturing Hα and OIII signals in deep-sky objects, this filter enhances contrast and reveals richer, more detailed structures in your astrophotography.
Dual Filters Designed for Detail and Clarity
Both filters in the set are optimized for fast optical systems, with the L-Para maintaining over 85% transmittance for OIII and Ha emission lines, delivering excellent contrast and anti-halo performance. The L-QEF filter offers over 90% transmittance for key nebula lines (Hb, OIII, Ha, SII) while effectively suppressing light pollution, enhancing color balance and reducing background noise. Together, they provide crisp, vivid images even in challenging, light-polluted skies.
- L-Quad Enhance Filter: Quad bandpass broadband filter captures the RGB signals of celestial targets
- L-Para : Dual narrowband 10 nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionized gas in deep-sky objects.
L-Quad Enhance Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Type: Quad bandpass broadband filter
- Thickness: 1.85 mm
- Transmission: >90% at H-Beta (486.1 nm), OIII (500.7 nm), H-Alpha (656.3 nm), and SII (672.4 nm)
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
L-Para Specifications
- 2" Round Mounted Filter (M48x0.75 male thread)
- Thickness: 1.85 mm
- Type: Dual narrowband 10 nm filter
- Transmission: >85% at OIII and H-Alpha wavelengths in systems with focal ratios of f/2 and above
- Blocking Range: 300–1000 nm
- Coating: Multi-layer anti-reflection coating
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 6.8 mm / 0.26 in
C = Filter Cell Height (Excluding Male Thread) = 4.8 mm / 0.18 in
M = Male Thread Length = 2.0 mm / 0.07 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 44 mm / 1.73 in
Other Information
- Country of Manufacture: China
- 1x L-Quad Enhance Filter
- 1x L-Para Filter
- Dust Cases
Optolong L1 Dual Combo Filter Set with L-QEF & L-Para Filters - 2" Mounted