Narrowband Filters
Chroma narrowband filters are designed to isolate specific astronomical emission lines with high contrast and minimal background interference. By tightly controlling band placement and blocking unwanted light, these filters enable detailed imaging of nebulae and other emission-rich objects, even under light-polluted skies.
Narrowband Filter Sets
Chroma offers matched narrowband filter sets optimized for consistent performance across common emission lines. Sets are available in multiple bandwidths to support different imaging conditions and system requirements. Each set consists of an H-alpha (Hα), Oxygen III (OIII), and Sulfur II (SII) filter.
SII Ha OIII - 3nm
Ultra-narrow bandpass sets designed for maximum contrast and background suppression, ideal for imaging under light-polluted skies or during bright moon phases.
SII Ha OIII - 5nm
Balanced sets that offer strong contrast while maintaining higher signal throughput, suitable for a wide range of imaging conditions.
SII Ha OIII - 3nm F/3
Ultra-narrow bandpass set designed for maximum contrast and background suppression. Optimized for fast optical systems (f/3)
LRGB + H-alpha Filter Sets
For broadband color imaging with enhanced nebular detail, Chroma offers LRGB + H-alpha filter sets that pair our standard LRGB filters with a dedicated H-alpha narrowband filter. These sets are available with 3 nm, 5 nm, or 8 nm H-alpha filters, allowing you to choose the level of contrast and background suppression that best fits your imaging conditions.
Ha3LRGB
Standard LRGB filters paired with a 3 nm H-alpha filter for maximum contrast and background suppression in nebular imaging.
Ha5LRGB
Standard LRGB filters paired with a 5 nm H-alpha filter, balancing strong contrast with increased signal throughput.
HaLRGB
Standard LRGB filters paired with an 8 nm H-alpha filter for higher throughput and flexible imaging conditions.
Individual Narrowband Filters
For custom configurations or incremental upgrades, Chroma also offers individual narrowband filters centered on commonly used astronomical emission lines.
H-alpha (Hα) Filters
Isolate hydrogen emission to reveal fine structure in nebulae and star-forming regions.
Oxygen III (O III) Filters
Capture doubly ionized oxygen emissions, highlighting energetic regions and complementary structures in narrowband imaging.
Sulfur II (S II) Filters
Designed to isolate sulfur emissions, commonly used in multi-channel narrowband workflows.
Hydrogen-beta (H-beta) Filters
Isolate hydrogen-beta emission, commonly used to enhance specific nebular structures and complement H-alpha imaging.
Helium II (He-II) Filters
Isolate helium emission lines, often used in specialized or research-oriented narrowband imaging.
Nitrogen II (N II) Filters
Target nitrogen emissions often used in advanced or research-focused narrowband imaging applications.
Need a Custom Narrowband Filter?
For observatories, research programs, or specialized imaging systems, Chroma develops custom narrowband filters with non-standard center wavelengths, bandwidths, sizes, or coating requirements.
Built for Long-Term Imaging Projects
Astronomy filters must maintain spectral accuracy across temperature changes, humidity, and years of use. Chroma’s hard-sputtered coatings are engineered for durability and stability, helping ensure consistent performance for long-term imaging projects and scientific studies.
As an ISO-certified manufacturer, we adhere to strict quality assurance procedures and stand behind this commitment with an industry-leading warranty—our assurance of long-term stability and performance.
Quick References & Education
Learn how to get the best results from your filters:
Technical Library — Application notes, white papers, and guides.
Cleaning & Handling Filters — Best practices to protect coatings and preserve performance.
Filter Orientation Guide — Correct installation of filters and dichroics.
Explore Related Applications
Chroma filters support a wide range of scientific and industrial applications. Explore other areas where our technology enables precision and reliability.
Work With Us
Chroma’s application scientists and engineers support astronomers and astrophotographers at every stage—from selecting catalog filters to developing custom solutions for observatories and instruments.
