Astronomy Filters

Defining Boundaries in Light Control

KRON/Cousins UVBRI Filters

Andover Astronomy Filters

Revealing the secrets of the cosmos with unmatched precision

Astronomy filters are specialized optical components designed to enhance the observation and imaging of celestial objects by isolating specific wavelengths of astronomical interest while rejecting unwanted light. These precision-engineered filters enable researchers and astronomers to study specific features of stars, nebulae, galaxies and other astronomical phenomena with exceptional clarity.

Each astronomy filter is characterized by several critical parameters:

  • Spectral Range: The specific wavelength band optimized for different astronomical targets
  • Image Quality: Ultra-precise polishing and coating for minimal wavefront distortion
  • Environmental Stability: Designed to maintain performance in varying temperatures and conditions
  • System Compatibility: Engineered to work with both visual and electronic imaging systems

Andover Corporation manufactures a comprehensive range of astronomy filters, from standard photometric systems like UBVRI (both Johnson/Bessell and Kron/Cousins sets) to specialized filters for solar observation and infrared astronomy. Using state-of-the-art thin film technology and premium optical materials, we deliver filters that meet the exacting demands of modern astronomical research, whether for ground-based observatories or space-borne instruments.

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Astronomy Filter Technologies

Astronomy filters require exceptional precision and optical quality to enable ground-breaking observations. Understanding the available technologies helps ensure optimal performance for your specific astronomical applications:

Standard UBVRI Systems

We offer both Johnson/Bessell and Kron/Cousins photometric systems, each optimized for different detector types. Johnson/Bessell filters are optimized for photomultiplier tubes, while Kron/Cousins variants are designed for superior performance with Silicon CCDs. All filters are precision polished with transmitted wavefront of λ/4 per inch and parallelism to 30 arc seconds or better.

Specialized Astronomical Filters

  • Sloan Digital Sky Survey (SDSS) filters with non-overlapping bands and steep transitions
  • Solar observation filters including H-alpha and CaK lines
  • Infrared astronomy filters covering J, H, K, L, M, and N bands
  • Custom solutions for space-based telescopes and observatories
By partnering with Andover Corporation, you join leading observatories worldwide who rely on our filters for groundbreaking astronomical research. From ground-based telescopes to space-borne instruments, our space-qualified filters continue to enable critical scientific discoveries.

Filters for Discovery: Astronomy Optics

From Ground-Based Observatories to Deep Space

For over four decades, Andover Corporation has provided the astronomical community with precision optical filters that enable breakthrough observations. From standard photometric systems to custom solutions for space-based instruments, our filters combine exceptional image quality with environmental stability to deliver reliable performance in the most demanding conditions.

FiltersForAstronmy_JohnsonBessell UBVRIFilters_22

Johnson/Bessell UBVRI Filters

Designed for photomultiplier tube detection systems, these filters maintain the original Johnson system specifications while incorporating Bessell's improvements for modern instruments.
  • U Band Center/FWHM 365nm/60nm
  • B Band Center/FWHM 440nm/100nm
  • V Band Center/FWHM 520nm/90nm
  • R Band Center/FWHM 630nm/120nm
  • I Band Center/FWHM 900nm/300nm
  • Transmission >70% typical
  • Image Quality λ/4 per inch
PMT Optimized
Image Quality
Heritage System
KRON/Cousins UVBRI Filters

Kron/Cousins UBVRI Filters

Optimized for Silicon CCD detectors, these filters provide precise photometric measurements across the ultraviolet, blue, visible, red and infrared bands. Essential for stellar classification and photometric surveys.
  • U Band Center/FWHM 365nm/60nm
  • B Band Center/FWHM 440nm/100nm
  • V Band Center/FWHM 520nm/90nm
  • R Band Center/FWHM 760nm/250nm
  • I Band Center/FWHM 800nm/150nm
  • Transmission >70% typical
  • Image Quality λ/4 per inch
CCD Optimized
Image Quality
Standard System
Optical filter or component from Andover Corporation shown on a white background.

Sloan Digital Sky Survey (SDSS) Filters

Designed for modern digital sky surveys, these filters feature non-overlapping bandpasses and steep transitions for precise photometric measurements across the visible spectrum.
  • u Band Center/FWHM 355nm/60nm
  • g Band Center/FWHM 475nm/140nm
  • r Band Center/FWHM 620nm/140nm
  • i Band Center/FWHM 750nm/140nm
  • z Band Center/FWHM 900nm/140nm
  • Transmission >85% peak
  • Out-of-band Rejection >OD4
Digital Survey
Non-overlapping
High Throughput
Set of Kron-Cousins UBVRI photometric filters for astronomy, arranged on a white background with visible color variation.

MKO Near-Infrared Filters

Developed in collaboration with the Mauna Kea Observatories (MKO), these near-infrared filters provide optimal performance for ground-based telescopes.

J- and H-band filters penetrate through atmospheric barriers, granting unprecedented access to celestial wonders. K-band filters, named after the German word for “short”, are perfect for short-range applications, adept at bypassing water vapor absorption for crisp imaging.

  • Thickness5.0mm ± 0.15mm
  • Size Tolerance+0.00 / -0.25mm
  • BevelsBreak all sharp edges
  • DurabilityPer MIL-C-48497A moderate abrasion
  • Transmitted Wavefront1/4 wave or better per 25mm
  • Parallelism30 arc seconds or better
  • Surface Quality60/40 or better per MIL-C-675
  • Optical QualityImage Quality
  • Exterior SurfacesAntireflective coatings
  • BlockingOD4
Optical filter or component from Andover Corporation shown on a white background.

L-, M-, and N-Band Infrared Filters

Favored by CubeSat and SmallSat markets, these filters cover a broad spectrum, from 3000nm to 12350nm, and are frequently used in aircraft surveillance, satellite navigation, and weather monitoring.

The N-Band filter excels in the far-infrared domain, where hot thermal masses like lava flows stand out. Used with both cooled and uncooled microbolometers, these filters offer a glimpse into the hottest spots on earth.

  • Thickness1.0mm ± 0.2mm
  • Paralellism< 10 arc minutes
  • Scratch/Dig80/50
  • Blocking OD3 avg
  • Transmission > 85%
Solar observation filter designed for astronomy, displayed on a white background.

Solar and Celestial Observation Filters

Unveil the wonders of the cosmos with our range of precision optical filters tailored for solar and space observation. From capturing the dynamic surface features of the Sun to combating light pollution and enhancing astrophotography, our filters are your gateway to clearer, more vibrant views of the universe.
  • Dimensionsø 1.25” threaded mount
  • Thickness10.0mm
  • Parallelism30 arc seconds or better
  • Scratch/Dig60/40
  • Flatness< 0.25 TWF @ 633nm
  • Blocking> OD4
Optical filter or component from Andover Corporation shown on a white background.

LRGB Filters for Astronomical Imaging

Red, Green, and Blue Filters
Used to accentuate features individually in the red, green, and blue parts of the spectrum, or in tandem to create composite images.

Luminance Filter
Enhance overall brightness and detail in your astrophotography.

  • Dimensionsø 1.25” threaded mount
  • Thickness10.0mm
  • Parallelism30 arc seconds or better
  • Scratch/Dig60/40
  • Flatness< 0.25 TWF @ 633nm
  • Blocking> OD4

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Frequently Asked Questions

What types of astronomy filters does Andover Corporation offer?
What are narrowband filters and how are they used in astronomy?
What’s the difference between UBVRI and Sloan (SDSS) filter sets?
Does Andover offer astronomy filters for space-based applications?
What are infrared astronomy filters used for?
Can I request custom astronomy filters for a specific research project or telescope?

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Ready to discuss your optical needs? Whether you're looking for a quote or have technical questions, our expert team is here to help guide you to the perfect solution.

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Questions?
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