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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

$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Optolong L-Quad Enhance Filter

OPT-14702
3 in stock

Quad-bandpass design for color cameras Suppresses light pollution with OD2-OD4 blocking depth Maintains sharpness with a λ/4 transmitted wavefront...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00
$309.00 - $309.00
$309.00
$309.00 - $309.00
$309.00

Optolong L-Synergy 7nm SII/OIII Dual Narrowband Filter

OPT-LSYNERGY
2 in stock

Captures Sulfur-II and Oxygen-III Emission Lines Simultaneously Engineered for Hubble Palette (SHO) Imaging with Color Cameras Strict 7nm Bandpass...

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$309.00 - $309.00
$309.00
$309.00 - $309.00
$309.00
$289.00 - $389.00
$289.00 - $389.00
$289.00 - $389.00
$289.00

Optolong L-Ultimate Ha/OIII 3nm Filter

Options available
14 variants in stock

Dual 3nm bandpass isolates Hydrogen-alpha and Oxygen-III emission lines Blocks light pollution across the 300-1000nm spectrum Greater than OD4 blo...

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$289.00 - $389.00
$289.00 - $389.00
$289.00 - $389.00
$289.00
$369.00 - $569.00
$369.00 - $569.00
$369.00 - $569.00
$369.00

Optolong LRGB + H-Alpha 7nm Filter Set

Options available

Complete 5-Filter LRGB and H-Alpha Set 7nm H-Alpha Filter Centered at 656.3nm Blocks 589nm Sodium Light Pollution Line High Transmission for Natur...

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$369.00 - $569.00
$369.00 - $569.00
$369.00 - $569.00
$369.00
$249.00 - $359.00
$249.00 - $359.00
$249.00 - $359.00
$249.00

Optolong LRGB Filter Set

Options available
9 variants in stock

Complete 4-filter LRGB set for monochrome cameras High average transmission of over 90% for maximum signal Blocks sodium light pollution at 589nm ...

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$249.00 - $359.00
$249.00 - $359.00
$249.00 - $359.00
$249.00
$665.00 - $1,009.00
$665.00 - $1,009.00
$665.00 - $1,009.00
$665.00

Optolong LRGB, Ha, OIII & SII Filter Set

Options available
3 variants in stock

Complete 7-filter set for monochrome astrophotography Includes Luminance, Red, Green, and Blue broadband filters Includes 3nm Hydrogen-alpha, Oxyg...

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$665.00 - $1,009.00
$665.00 - $1,009.00
$665.00 - $1,009.00
$665.00
Optolong Night Sky H-Alpha IR Pass Filter
$79.00 - $119.00
$79.00 - $119.00
$79.00 - $119.00
$79.00

Optolong Night Sky H-Alpha IR Pass Filter

Options available

Passes Infrared Light >650nm Blocks Visible Light from 300-570nm Average Transmission >90% 1.85mm Thick Optical Glass Substrate λ/4 Transmit...

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$79.00 - $119.00
$79.00 - $119.00
$79.00 - $119.00
$79.00
Optolong OIII 3nm Narrowband Filter
$339.00 - $419.00
$339.00 - $419.00
$339.00 - $419.00
$339.00

Optolong OIII 3nm Narrowband Filter

Options available
1 variants in stock

3nm Spectral Bandpass 500nm Central Wavelength (OIII) Ion-Assisted Multi-Layer Coatings Optimized for Monochrome Cameras Available in 2" Mounted o...

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$339.00 - $419.00
$339.00 - $419.00
$339.00 - $419.00
$339.00
Optolong OIII 6.5nm Narrowband Filter
$159.00 - $229.00
$159.00 - $229.00
$159.00 - $229.00
$159.00

Optolong OIII 6.5nm Narrowband Filter

Options available
3 variants in stock

6.5nm Narrowband OIII Filter Centered on 500nm Wavelength Captures both 495.9nm and 500.7nm Emission Lines Blocks Light Pollution and Skyglow Idea...

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$159.00 - $229.00
$159.00 - $229.00
$159.00 - $229.00
$159.00
Optolong SII 3nm Narrowband Filter
$339.00 - $419.00
$339.00 - $419.00
$339.00 - $419.00
$339.00

Optolong SII 3nm Narrowband Filter

Options available
1 variants in stock

Isolates the Sulfur-II (SII) emission line for astrophotography Extremely narrow 3nm bandpass for maximum contrast Drastically reduces skyglow and...

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$339.00 - $419.00
$339.00 - $419.00
$339.00 - $419.00
$339.00
Optolong SII 6.5nm Narrowband Filter
$159.00 - $229.00
$159.00 - $229.00
$159.00 - $229.00
$159.00

Optolong SII 6.5nm Narrowband Filter

Options available
3 variants in stock

Isolates the Sulfur-II (SII) emission line at 672nm Tight 6.5nm bandpass for maximum contrast Enables imaging in heavily light-polluted skies and ...

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$159.00 - $229.00
$159.00 - $229.00
$159.00 - $229.00
$159.00
$44.00 - $65.00
$44.00 - $65.00
$44.00 - $65.00
$44.00

Optolong UV/IR Cut Filter

Options available
13 variants in stock

Blocks Ultraviolet (UV) and Infrared (IR) wavelengths Improves image sharpness and reduces star bloat Functions as a luminance (L) filter for mono...

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$44.00 - $65.00
$44.00 - $65.00
$44.00 - $65.00
$44.00
$336.00 - $336.00
$336.00
$336.00 - $336.00
$336.00

Pegasus Astro LRGB Filter Set - 2"

PEG-FLTR-2M-LRGB

Complete 4-filter LRGB set for broadband deep-sky imaging Standard 2-inch mounted format for wide compatibility Guaranteed 1/4 wavefront optical p...

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$336.00 - $336.00
$336.00
$336.00 - $336.00
$336.00
Player One Anti-Halo PRO Dual-Band 2″ Ha+OIII filter
$499.00 - $499.00
$499.00
$499.00 - $499.00
$499.00

Player One Anti-Halo PRO Dual-Band Ha/OIII Filter - 2"

POA-AHP-HO-2

Advanced Halo Suppression: Specifically engineered to eliminate halos around even the brightest stars. Dual-Band Ha+OIII Design: Captures hydrog...

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$499.00 - $499.00
$499.00
$499.00 - $499.00
$499.00
Player One Ha 7nm Narrowband Filter S-series – 2"
Player One Ha 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One Ha 7nm Narrowband Filter S-series

Options available

7nm Hydrogen-alpha (Ha) Narrowband Filter Available in 1.25" Threaded Cell and 2" Round Mounted Formats Optimized for Monochrome CMOS/CCD Cameras ...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
Player One IR685nm 1.25″ IR-Pass Filter S-series
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00

Player One IR685nm IR-Pass Filter S-series - 1.25"

POA-IR685

Passes infrared light with wavelengths greater than 685nm Standard 1.25" filter format for broad compatibility Significantly improves image stabil...

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$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Player One IR850nm 1.25″ IR-Pass Filter S-series
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00

Player One IR850nm IR-Pass Filter S-series - 1.25"

POA-IR850

Passes Infrared Light at 850nm Standard 1.25" Filter Size Blocks Visible and Ultraviolet Light High-Quality Optical Glass Substrate Multi-Layer An...

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$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Player One LRGB Filter S-series – 2"
Player One LRGB Filter S-series – 1.25"
$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00

Player One LRGB Filter S-series

Options available

LRGB filter set for monochrome astrophotography Available in 1.25" and 2" sizes (2" round mounted for larger sensors) Constructed from high-qualit...

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$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00
Player One OIII 7nm Narrowband Filter S-series – 2"
Player One OIII 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One OIII 7nm Narrowband Filter S-series

Options available

Oxygen-III (OIII) 7nm Narrowband Filter Available in 1.25" and 2" Sizes for Narrowband Astrophotography High-Transmission, Multi-Layer Coatings Hi...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
Player One SII 7nm Narrowband Filter S-series – 2"
Player One SII 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One SII 7nm Narrowband Filter S-series

Options available

Sulfur-II (SII) Narrowband Filter 7nm Narrowband Passband Available in 1.25" and 2" Mounted Formats Optimized for High-Contrast Astrophotography A...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

Player One UV/IR-Cut Anti-Halo Filter - 2"

POA-AH-UV-IR-CUT-2
2 in stock

Blocks unwanted Ultraviolet (UV) and Infrared (IR) wavelengths Features advanced anti-halo coatings to minimize reflections Standard 2" filter cel...

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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

Player One UV/IR-Cut S-Series Filter - 1.25"

POA-UV-IR-CUT-125
3 in stock

Corrects Color Balance for Color Cameras Blocks Unwanted Ultraviolet (UV) and Infrared (IR) Light Enhances Contrast for Lunar and Solar Imaging Hi...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00

Player One UVenus UV-Pass Filter E-series - 1.25"

POA-UV125E

Reveals Cloud Detail on Venus UV-Pass Band Optimized for Planetary Imaging E-Series High-Quality Optical Glass Substrate 1.25" Mounted Filter Form...

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$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00

QHYCCD 1200-1800nm SWIR Filter

QHY-040028

1200-1800nm SWIR Bandpass Designed for QHYCCD InGaAs Cameras Compatible with QHY990 Series Description FAQ Specifications In the Box Warranty ...

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$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00

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.