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Imaging Filters

Not every imaging filter is narrowband or LRGB. Ultraviolet and infrared cut filters, luminance filters, methane band filters for planetary work and dedicated infrared pass filters each solve a specific problem, and several of them are more useful than their obscurity suggests. David Astro carries imaging filters in Canada, in Canadian inventory and shipped domestically.

These filters address particular situations rather than general imaging. Tell us what problem you are seeing and we will say whether one of them fixes it.

Filters

$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00

Antlia 3nm Narrowband H-alpha Pro Filter

Options available
8 variants in stock

656.3nm H-alpha Central Wavelength Small 3nm FHWM High >88% Peak Transmission Minimized halos on bright stars Description Specificat...

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$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00
$268.00 - $515.00
$268.00 - $515.00
$268.00 - $515.00
$268.00

Antlia 3nm Narrowband H-alpha Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 656.3nm H-alpha Central Wavelength for High-Speed Systems Optimized 3nm FHWM for f/2.6–f/3.6 High >90% Peak Transmission Enhanced S...

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$268.00 - $515.00
$268.00 - $515.00
$268.00 - $515.00
$268.00
$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00

Antlia 3nm Narrowband OIII Pro Filter

Options available
8 variants in stock

Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nmbandpass. As the bandwidth becomes narrower, the 3nm Pro narro...

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$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00
$268.00 - $515.00
$268.00 - $515.00
$268.00 - $515.00
$268.00

Antlia 3nm Narrowband OIII Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 500.7nm OIII Central Wavelength for High-Speed Systems Optimized 3nm FHWM for f/2.6–f/3.6 High >90% Peak Transmission Enhan...

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$268.00 - $515.00
$268.00 - $515.00
$268.00 - $515.00
$268.00
$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00

Antlia 3nm Narrowband SII Pro Filter

Options available
7 variants in stock

Antlia SII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narro...

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$255.00 - $490.00
$255.00 - $490.00
$255.00 - $490.00
$255.00
$263.38 - $506.40
$263.38 - $506.40
$263.38 - $506.40
$263.38

Antlia 3nm Narrowband SII Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 673.6nm SII Central Wavelength for High-Speed Systems Optimized 3nm FWHM for f/2.6–f/3.6 High >90% Peak Transmission Enhanc...

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$263.38 - $506.40
$263.38 - $506.40
$263.38 - $506.40
$263.38
$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00

Antlia 4.5nm Narrowband H-alpha Edge Filter

Options available
8 variants in stock

Antlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on ...

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$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00
$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00

Antlia 4.5nm Narrowband OIII Edge Filter

Options available
8 variants in stock

Antlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unw...

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$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00
$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00

Antlia 4.5nm Narrowband SII Edge Filter

Options available
7 variants in stock

Antlia SII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwa...

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$185.00 - $350.00
$185.00 - $350.00
$185.00 - $350.00
$185.00
$390.00 - $390.00
$390.00
$390.00 - $390.00
$390.00

Antlia ALP-T Dual Band Ha&OIII 3nm

ANT-ALP-T-3NM-HAOIII
4 in stock

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio ...

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$390.00 - $390.00
$390.00
$390.00 - $390.00
$390.00
$710.00 - $710.00
$710.00
$710.00 - $710.00
$710.00

Antlia ALP-T Dual Band Ha&OIII 3nm + SII&Hb 3.5nm 2" Filter Set

ANT-ALP-T-3NM-KIT

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio ...

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$710.00 - $710.00
$710.00
$710.00 - $710.00
$710.00
$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00

Antlia ALP-T Dual Band SII&Hβ 3.5nm

ANT-ALP-T-3NM-SIIHB
2 in stock

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio Anti-Reflection Coating to Reduce H...

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$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00
$690.00 - $690.00
$690.00
$690.00 - $690.00
$690.00

Antlia ALP-T Dualband 5nm Ha/OIII and SII/Hb Filter Set - 2"

ANT-ALP-T-SET

$690.00 - $690.00
$690.00
$690.00 - $690.00
$690.00
$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00

Antlia ALP-T Dualband 5nm Ha/OIII Filter

ANT-ALP-T-2

The Antlia ALP-T dual band 5nm Ha&OIII filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cam...

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$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00

Antlia ALP-T Dualband 5nm Ha/OIII Highspeed Filter

ANT-ALP-T-HS-2

ALP-T Dual Band 5nm Highspeed Filters are further optimized to work with high-speed imaging systems by shifting slightly the passband and center w...

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$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Antlia ALP-T Dualband 5nm SII/Hb Filter

ANT-ALP-T-SII-HB-2

The ALP-T dual band 5nm SII&Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and the blue Hydrogen-Beta line throu...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Antlia IR Pass 685nm Filter - 1.25"

ANT-IR685
3 in stock

The Antlia IR Pass 685nm filter is an absorptive filter that allows infrared light with wavelengths of more than 685nm to pass through. At these l...

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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Antlia IR Pass 850nm Filter - 1.25"

ANT-IR850
3 in stock

The Antlia IR Pass 850nm filter is an absorptive filter that allows infrared light with wavelengths of more than 850nm to pass through. It is a su...

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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$300.00 - $600.00
$300.00 - $600.00
$300.00 - $600.00
$300.00

Antlia LRGB-V Pro Filter Set

Options available
8 variants in stock

Four-Filter LRGB Complement Engineered for Monochrome CMOS/CCD Cameras Anti-Reflection Coated Optics Available in 5 Mounted and Unmounted Sizes ...

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$300.00 - $600.00
$300.00 - $600.00
$300.00 - $600.00
$300.00
$198.00 - $198.00
$198.00
$198.00 - $198.00
$198.00

Antlia Quad Band Light Pollution Filter - 2"

ANT-QUAD-2
5 in stock

The Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky...

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$198.00 - $198.00
$198.00
$198.00 - $198.00
$198.00
$179.00 - $179.00
$179.00
$179.00 - $179.00
$179.00

Antlia Triband RGB Ultra Filter V2

ANT-TRIBAND-V2
4 in stock

Enhanced Transmission for Superior Signal-to-Noise Ratio Anti-Reflection Coating to Reduce Halo Effect Optimized for Fast Optics up to f/2 Desc...

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$179.00 - $179.00
$179.00
$179.00 - $179.00
$179.00
$1,178.54 - $1,178.54
$1,178.54
$1,178.54 - $1,178.54
$1,178.54

Askar 3nm Colour Magic Ha/OIII & SII/OIII (E1+E2) Filter Package

ASK-CM-E1E2
1 in stock

Enables SHO "Hubble Palette" imaging with a one-shot-color (OSC) camera Includes two 3nm dual-bandpass filters: E1 (Hα+OIII) and E2 (SII+OIII) Iso...

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$1,178.54 - $1,178.54
$1,178.54
$1,178.54 - $1,178.54
$1,178.54
$605.00 - $605.00
$605.00
$605.00 - $605.00
$605.00

Askar 3nm Colour Magic Ultra Ha/OIII E1 Filter - 2"

ASK-ASKAR2DBE1
1 in stock

Dual-bandpass for Hydrogen-alpha (656.6nm) and Oxygen-III (500.7nm) Ultra-narrow 3.7nm (Ha) and 4.0nm (OIII) FWHM bandwidths 85% peak transmittanc...

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$605.00 - $605.00
$605.00
$605.00 - $605.00
$605.00
$594.89 - $594.89
$594.89
$594.89 - $594.89
$594.89

Askar 3nm Colour Magic Ultra OIII/SII E2 Filter - 2"

ASK-ASKAR2DBE2
1 in stock

Dual-bandpass design captures OIII (500.7nm) and SII (672nm) simultaneously Narrow 3.7nm (OIII) and 4.0nm (SII) FWHM for high-contrast imaging Pea...

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$594.89 - $594.89
$594.89
$594.89 - $594.89
$594.89

Specialist Imaging Filters

Each of these targets a specific defect or a specific wavelength range that general-purpose filters do not address.

  • UV and IR cut filters: Essential with refractors, which do not focus infrared at the same point as visible light. Without one, stars are bloated and soft in a way that looks like poor optics.
  • Luminance filters: A broad visible-range filter with UV and IR blocking, used as the detail-carrying channel in LRGB imaging.
  • Infrared pass filters: Pass only infrared, which cuts through atmospheric turbulence better than visible light and can sharpen planetary detail in poor seeing.
  • Methane band filters: Very narrow filters at 889 nm revealing atmospheric structure on Jupiter, Saturn and the ice giants that is invisible in visible light.
  • Continuum filters: Narrow green-band filters used for lunar and planetary imaging, reducing the effect of atmospheric dispersion.
  • Anti-halation and reflection considerations: Coating quality matters here too, since a filter close to the sensor can produce reflection artifacts around bright objects.

Why Choose David Astro for Imaging Filters

These are problem-specific purchases, and the first question is whether you have the problem.

  • Diagnosis before recommendation: Send us a sample image and we will tell you whether bloated stars are an infrared problem, a spacing problem or a focus problem.
  • Refractor advice: If you image with a doublet and have no UV/IR cut filter, that is very often the cause of soft bright stars, and it is the cheapest fix in imaging.
  • Seeing-based advice: We will explain when an infrared pass filter genuinely helps planetary work and when it simply costs you resolution.
  • Authorized dealer: Genuine filters with verified coatings and manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees for Canadian buyers.

Imaging Filters in Canada — Frequently Asked Questions

Do I need a UV/IR cut filter?
With any refractor, yes. ED doublets and even triplets do not bring infrared to the same focus as visible light, and an unfiltered sensor records that as bloated, soft stars.
Does an infrared filter help with bad seeing?
For planetary imaging, often yes. Longer wavelengths are less affected by atmospheric turbulence, so an IR pass filter can produce sharper results on a poor night, at the cost of some resolution.
What is a methane band filter for?
It isolates a methane absorption band at 889 nm, revealing cloud structure on the gas giants that is invisible in visible light. It is a specialist filter needing substantial aperture and long exposures.
Why are my bright stars bloated?
Most commonly unblocked infrared in a refractor, sometimes filter reflections, sometimes back-focus error. Send us a crop and we will tell you which.

Diagnosing an imaging problem?

Send us a sample crop and we will tell you what will actually fix it. Held in Canada, shipped fast.