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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

$625.00 - $625.00
$625.00
$625.00 - $625.00
$625.00

Askar 6nm Colour Magic Ha/OIII & SII/OIII (D1+D2) Filter Package

ASK-CM-D1D2
1 in stock

6nm Dual-Bandpass Filter Set Includes D1 (Hα+OIII) and D2 (SII+OIII) Filters Enables SHO-like imaging with color cameras High contrast for light-p...

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$625.00 - $625.00
$625.00
$625.00 - $625.00
$625.00
$319.00 - $319.00
$319.00
$319.00 - $319.00
$319.00

Askar 6nm Colour Magic Super Ha/OIII D1 Filter - 2"

ASK-ASK2DNHOD1
1 in stock

Dual-Bandpass: 8.5nm H-alpha & 6.5nm OIII Peak Transmittance: >85% at 500.7nm and 656.6nm Light Pollution Suppression: ≥OD5 blocking from 2...

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$319.00 - $319.00
$319.00
$319.00 - $319.00
$319.00
$319.00 - $319.00
$319.00
$319.00 - $319.00
$319.00

Askar 6nm Colour Magic Super SII/OIII D2 Filter - 2"

ASK-ASK2DNSOD2
1 in stock

Dual-band filter passing OIII (6.5nm) and SII (8.5nm) wavelengths Peak transmittance of 85% for maximum signal capture Designed for color cameras ...

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$319.00 - $319.00
$319.00
$319.00 - $319.00
$319.00
$225.00 - $225.00
$225.00
$225.00 - $225.00
$225.00

Askar Colour Magic Ha/OIII & SII/OIII (C1+C2) Filter Package

ASK-CM-C1C2
2 in stock

Complete 2-Filter Narrowband Solution for Color Cameras Captures H-alpha, Oxygen-III, and Sulfur-II Wavelengths Filter 1 (C1): Hα + OIII Duo-Band ...

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$225.00 - $225.00
$225.00
$225.00 - $225.00
$225.00
$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00

Askar Colour Magic Ha/OIII C1 Filter - 2"

ASK-ASKAR2DBC1
2 in stock

Dual-bandpass filter for H-alpha (656.6nm) and Oxygen-III (500.7nm) Asymmetrical bandwidths: 15nm for H-alpha, 35nm for OIII Greater than 90% peak...

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$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00

Askar Colour Magic SII/OIII C2 Filter - 2"

ASK-ASKAR2DBC2
3 in stock

Dual-band filter passing SⅡ (672nm) and OIII (500.7nm) emission lines Designed for one-shot-color cameras to capture data often missed by Hα/OIII ...

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$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00
Save 25% Save %
$484.00
$484.00 - $484.00
$484.00
$363.00
$363.00 - $363.00
$363.00

Astrodon H-alpha Filter - 5nm

DON-HA5_31R
Only 1 left!

H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and i...

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$484.00
$484.00 - $484.00
$484.00
$363.00
$363.00 - $363.00
$363.00
Save 25% Save %
Sold out
$484.00
$484.00 - $484.00
$484.00
$363.00
$363.00 - $363.00
$363.00

Astrodon SII Filter - 5nm

DON-SII5_31R

If you want the look of Hubble Space Telescope (HST) images, such as the famous “Pillars of Creation” (the Eagle Nebula, Messier 16), then the next...

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$484.00
$484.00 - $484.00
$484.00
$363.00
$363.00 - $363.00
$363.00
Sold out
$946.00 - $2,105.00
$946.00 - $2,105.00
$946.00 - $2,105.00
$946.00

Baader 3.5/4nm f/2 Ultra-Highspeed Filter Set - CMOS-Optimized H-alpha/O-III/S-II

Options available

3.5nm (H-alpha, S-II) and 4nm (O-III) Bandpasses Optimized for f/2 Ultra-Highspeed Optical Systems CMOS-Optimized with Reflex-Blocker™ Coatings Pr...

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$946.00 - $2,105.00
$946.00 - $2,105.00
$946.00 - $2,105.00
$946.00
$929.00 - $1,982.00
$929.00 - $1,982.00
$929.00 - $1,982.00
$929.00

Baader 3.5nm / 4nm Narrowband Filter Set - CMOS-Optimized H-alpha/O-III/S-II

Options available
1 variants in stock

3-Filter Set: H-alpha (3.5nm), O-III (4nm), S-II (3.5nm) Ultra-Narrow Bandpasses for Maximum Image Contrast CMOS-Optimized to Eliminate Halos and ...

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$929.00 - $1,982.00
$929.00 - $1,982.00
$929.00 - $1,982.00
$929.00
$320.00 - $692.00
$320.00 - $692.00
$320.00 - $692.00
$320.00

Baader 4nm Ultra-Narrowband OIII Filter - CMOS-Optimized

Options available
1 variants in stock

4nm Ultra-Narrowband OIII Bandpass Optimized for Modern CMOS Sensors Reflex-Blocker™ Hard Coatings to Prevent Halos Life-Coat™ Technology for Extr...

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$320.00 - $692.00
$320.00 - $692.00
$320.00 - $692.00
$320.00
$548.00 - $1,310.00
$548.00 - $1,310.00
$548.00 - $1,310.00
$548.00

Baader 6.5nm f/2 Highspeed Filter Set - CMOS-Optimized H-alpha/O-III/S-II

Options available
1 variants in stock

Set of 3 Narrowband Filters: H-alpha, O-III, and S-II 6.5nm Bandpass for high-contrast imaging Optimized for f/2 to f/3.5 High-Speed Optical Syste...

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$548.00 - $1,310.00
$548.00 - $1,310.00
$548.00 - $1,310.00
$548.00
$188.00 - $481.00
$188.00 - $481.00
$188.00 - $481.00
$188.00

Baader 6.5nm H-alpha Filter - CMOS-Optimized

Options available

6.5nm FWHM Bandpass CMOS-Optimized Anti-Reflection Coatings Reflex-Blocker™ coatings to prevent halos Life-Coat™ scratch-resistant hard coatings A...

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$188.00 - $481.00
$188.00 - $481.00
$188.00 - $481.00
$188.00
$512.00 - $1,287.00
$512.00 - $1,287.00
$512.00 - $1,287.00
$512.00

Baader 6.5nm Narrowband Filter Set - CMOS-Optimized H-alpha/O-III/S-II

Options available

6.5nm Narrowband Filter Set for H-alpha, O-III, and S-II Optimized specifically for modern CMOS astronomy cameras Reflex-Blocker™ coatings prevent...

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$512.00 - $1,287.00
$512.00 - $1,287.00
$512.00 - $1,287.00
$512.00
$179.00 - $470.00
$179.00 - $470.00
$179.00 - $470.00
$179.00

Baader 6.5nm OIII Filter - CMOS-Optimized

Options available

6.5nm FWHM Bandpass Optimized for Modern CMOS Sensors Reflex-Blocker™ Hard Coatings Available in 7 Formats (Mounted and Unmounted) Plane-Parallel ...

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$179.00 - $470.00
$179.00 - $470.00
$179.00 - $470.00
$179.00
$176.00 - $468.00
$176.00 - $468.00
$176.00 - $468.00
$176.00

Baader 6.5nm SII Filter - CMOS-Optimized

Options available

6.5nm FWHM Bandpass Optimized for Modern CMOS Sensors Suppresses Halos and Internal Reflections High-Contrast for Sulfur-II Emission Nebulae Avail...

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$176.00 - $468.00
$176.00 - $468.00
$176.00 - $468.00
$176.00
$111.00 - $111.00
$111.00
$111.00 - $111.00
$111.00

Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300

BAA-2459211

Designed for Canon EOS 300 DSLR Astro-Conversion Dramatically Improved Spectral Transmission for Astrophotography Unlocks Critical Hydrogen-Alpha ...

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$111.00 - $111.00
$111.00
$111.00 - $111.00
$111.00
$128.00 - $128.00
$128.00
$128.00 - $128.00
$128.00

Baader ACF DSLR Astro Conversion Filter - for Canon EOS 350D/10D/20D/30D

BAA-2459212

Designed for Canon EOS 350D, 10D, 20D, and 30D DSLRs Improves Spectral Transmission for Astrophotography Unlocks Sensitivity to Hydrogen-Alpha (Hα...

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$128.00 - $128.00
$128.00
$128.00 - $128.00
$128.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

Baader BCF DSLR Astro Conversion Filter - for Canon EOS

BAA-2459213
1 in stock

Replaces stock DSLR filter to dramatically increase H-alpha sensitivity Enables detailed imaging of emission nebulae Designed for a wide range of ...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$55.00 - $155.00
$55.00 - $155.00
$55.00 - $155.00
$55.00

Baader Clear Focusing Filter

Options available
1 variants in stock

Enables precise focusing for dim narrowband filters Perfectly parfocal with other Baader Planetarium filters Optically polished to ensure no image...

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$55.00 - $155.00
$55.00 - $155.00
$55.00 - $155.00
$55.00
$108.00 - $155.00
$108.00 - $155.00
$108.00 - $155.00
$108.00

Baader Fringe-Killer Filter

Options available
2 variants in stock

Reduces violet/blue color fringing in achromatic refractors Blocks unfocused near-infrared (NIR) light for sharper digital images Maintains a natu...

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$108.00 - $155.00
$108.00 - $155.00
$108.00 - $155.00
$108.00
$109.00 - $264.00
$109.00 - $264.00
$109.00 - $264.00
$109.00

Baader H-Alpha CCD Filter -35nm

Options available

Premium grade H-alpha interline chip CCD-filter for fast optical systems f/10 to f/2.8 IR-blocked NO halos, NO reflections, NO ghosting Non-aging ...

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$109.00 - $264.00
$109.00 - $264.00
$109.00 - $264.00
$109.00
$110.00 - $175.00
$110.00 - $175.00
$110.00 - $175.00
$110.00

Baader IR-Pass Filter 685nm

Options available
3 variants in stock

685nm Infrared (IR) Pass Filter Transmits deep-red light starting from 670nm Dramatically reduces the image-blurring effects of atmospheric seeing...

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$110.00 - $175.00
$110.00 - $175.00
$110.00 - $175.00
$110.00
$391.00 - $1,063.00
$391.00 - $1,063.00
$391.00 - $1,063.00
$391.00

Baader LRGB Filter Set - CMOS-Optimized

Options available

Designed specifically to eliminate reflections and halos with modern CMOS sensors Balanced RGB transmission enables simplified 1:1:1 exposure rati...

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$391.00 - $1,063.00
$391.00 - $1,063.00
$391.00 - $1,063.00
$391.00

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.