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Filtres d'astrophotographie

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.

Filtres

Prix d'origine $249.99 - Prix d'origine $249.99
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Explore Scientific Nebula Filter H-Alpha 2-inch 12nm

ES-310130

Isolates the Hydrogen-alpha emission line at a 12nm bandpass Standard 2-inch filter format for modern focusers and filter wheels Dramatically incr...

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Prix d'origine $249.99 - Prix d'origine $249.99
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Prix d'origine $299.99 - Prix d'origine $299.99
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Explore Scientific Nebula Filter H-Alpha 2-inch 7nm

ES-310140

7nm H-Alpha Bandpass 2-inch Filter Format Isolates Hydrogen Emission Nebulae Blocks Urban Light Pollution Includes Individual Test Report Descr...

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Prix d'origine $299.99 - Prix d'origine $299.99
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Prix d'origine $159.99 - Prix d'origine $159.99
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$159.99
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Explore Scientific Nebula Filter S-II 1.25-inch 12nm

ES-310115

Isolates the ionized sulfur (S-II) emission line at 672nm Features a 12nm bandpass to increase contrast Standard 1.25-inch filter format Ideal for...

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Prix d'origine $159.99 - Prix d'origine $159.99
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$159.99
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Prix d'origine $199.99 - Prix d'origine $199.99
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Explore Scientific Nebula Filter S-II 1.25-inch 6.5nm

ES-310125

Isolates the ionized sulfur (S-II) emission line at 672nm Ultra-narrow 6.5nm bandpass for maximum contrast Standard 1.25-inch barrel size fits mos...

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Prix d'origine $199.99 - Prix d'origine $199.99
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Prix d'origine $249.99 - Prix d'origine $249.99
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$249.99
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Explore Scientific Nebula Filter S-II 2-inch 12nm

ES-310110

Isolates the 672nm Sulfur-II (S-II) emission line 12nm bandpass for high-contrast views 2-inch filter size with standard threads Blocks light poll...

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Prix d'origine $249.99 - Prix d'origine $249.99
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Prix d'origine $299.99 - Prix d'origine $299.99
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Explore Scientific Nebula Filter S-II 2-inch 6.5nm

ES-310120

6.5nm Narrow Bandpass Targets the 672nm Ionized Sulfur (S-II) Emission Line 2-inch Barrel Diameter for Larger Focusers Drastically Increases Contr...

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Prix d'origine $299.99 - Prix d'origine $299.99
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Prix d'origine $298.00 - Prix d'origine $298.00
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IDAS NBZ-II HA OIII Nebula Booster Filter

IDA-NBZ-II-48ST2

2" OIII 8nm (+/-0.4nm) H-alpha 9.5nm (+/- 0.4nm) (originally designed at 10nm, but on a measured basis, it's 9.5nm.)

Prix d'origine $298.00 - Prix d'origine $298.00
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Prix d'origine $219.00 - Prix d'origine $219.00
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iOptron LRGB Imaging Filter Kit - 1.25"

IOP-3383-LRGB

Complete LRGB Filter Set Includes Luminance, Red, Green, and Blue Filters Standard 1.25" Filter Size Threaded for Standard Filter Wheels and Acces...

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Prix d'origine $219.00 - Prix d'origine $219.00
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Prix d'origine $24.00 - Prix d'origine $30.00
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Optolong Clear Focusing Filter

Options available
2 variants in stock

Achieve Critical Focus with Dim Stars Transmission >98.5% Across the Visible Spectrum λ/4 Transmitted Wavefront for Image Integrity Parfocal wi...

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Prix d'origine $24.00 - Prix d'origine $30.00
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Prix d'origine $99.00 - Prix d'origine $205.00
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Optolong Clear Sky Light Pollution Filter

Options available

Suppresses common sources of urban light pollution Enhances contrast for deep-sky objects Improves natural color balance in astrophotography Durab...

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Prix d'origine $99.00 - Prix d'origine $205.00
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Prix actuel $99.00
Prix d'origine $55.00 - Prix d'origine $85.00
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Optolong CLS Light Pollution Filter

Options available

Suppresses common light pollution sources Average transmission greater than 90% on key nebula emission lines Blocks light pollution lines with >...

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Prix d'origine $55.00 - Prix d'origine $85.00
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Prix d'origine $95.00 - Prix d'origine $159.00
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Optolong CLS-CCD Light Pollution Filter

Options available

Blocks >99% of primary light pollution emission lines Achieves >90% average transmission on key nebula wavelengths Integrated 300-1100nm UV/...

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Prix d'origine $95.00 - Prix d'origine $159.00
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Prix d'origine $339.00 - Prix d'origine $419.00
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Optolong H-alpha 3nm Narrowband Filter

Options available
1 variants in stock

3nm Bandpass at 656nm Wavelength Maximizes Contrast for Emission Nebulae Extreme Rejection of Light Pollution and Skyglow Ion-Assisted, Anti-Refle...

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Prix d'origine $339.00 - Prix d'origine $419.00
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Prix actuel $339.00
Prix d'origine $159.00 - Prix d'origine $229.00
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Optolong H-Alpha 7nm Narrowband Filter

Options available
3 variants in stock

Isolates the 656nm Hydrogen-alpha emission line 7nm bandpass for maximum contrast Blocks mercury vapor, sodium vapor, and natural skyglow Ideal fo...

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Prix d'origine $159.00 - Prix d'origine $229.00
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Prix d'origine $465.00 - Prix d'origine $669.00
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Optolong Ha 7nm, OIII 6.5nm & SII 6.5nm Filter Set

Options available

H-alpha Filter: 7nm Bandpass centered at 656nm Oxygen-III Filter: 6.5nm Bandpass centered at 500nm Sulphur-II Filter: 6.5nm Bandpass Hubble Pa...

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Prix d'origine $465.00 - Prix d'origine $669.00
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Prix d'origine $960.00 - Prix d'origine $1,199.00
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Optolong Ha, OIII & SII 3nm Narrowband Filter Set

Options available

Complete SHO set includes H-alpha, OIII, and SII filters Ultra-narrow 3nm bandpass for maximum contrast Isolates 656nm Ha and 500nm OIII emission ...

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Prix d'origine $960.00 - Prix d'origine $1,199.00
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Prix d'origine $79.00 - Prix d'origine $115.00
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Optolong IR Pass 685nm Planetary Filter

Options available
3 variants in stock

Passes infrared light above 685nm Achieves greater than 90% peak transmission Blocks wavelengths from 350-1050nm outside the passband 1.85mm thick...

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Prix d'origine $79.00 - Prix d'origine $115.00
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Prix d'origine $179.00 - Prix d'origine $259.00
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Filtre Optolong L-Enhance

Options available
7 variants in stock

Optolong L-eNhance est un filtre passe-bande double qui a été conçu pour les appareils photo reflex numériques (SLR), CMOS couleur et CCD monochro...

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Prix d'origine $179.00 - Prix d'origine $259.00
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Prix d'origine $569.00 - Prix d'origine $569.00
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Optolong L-Extreme + L-Synergy L2 Dual-Combo Filter Set - 2"

OPT-L2-COMBO
2 en stock

Includes L-eXtreme (H-alpha + OIII) and L-Synergy (SII + OIII) filters Enables Hubble Palette (SHO) imaging with one-shot color cameras Captures t...

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Prix d'origine $569.00 - Prix d'origine $569.00
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Prix d'origine $239.00 - Prix d'origine $309.00
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Filtre Optolong L-Extrême

Options available
7 variants in stock

L-eXtreme est un filtre passe-bande de deux 7 nm qui peut être utilisé avec des caméras couleur à un coup comme les reflex numériques (SLR) et les ...

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Prix d'origine $239.00 - Prix d'origine $309.00
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Prix actuel $239.00
Prix d'origine $259.00 - Prix d'origine $259.00
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Optolong L-Para HA/OIII 10nm Filter - 2"

OPT-AS100221
5 en stock

Dual Narrowband H-Alpha & OIII Filter Suppresses Mercury, Sodium & LED Light Pollution Optimized for Fast-Ratio Systems (RASA, HyperStar) ...

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Prix d'origine $259.00 - Prix d'origine $259.00
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Prix d'origine $299.00 - Prix d'origine $299.00
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$299.00
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Optolong L-Pro + UHC Clip Filter Kit

Options available

Two Optolong Clip-in Light Pollution Filters in One Kit L-Pro: Multi-Bandpass Suppression Across 380-750nm UHC: >99% Blocking of Mercury and So...

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Prix d'origine $299.00 - Prix d'origine $299.00
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$299.00
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Prix actuel $299.00
Prix d'origine $149.00 - Prix d'origine $269.00
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Prix actuel $149.00

Optolong Filtre L-Pro

Options available
11 variants in stock

Filtre de réduction de la pollution lumineuse Conserve la balance naturel des couleurs de vos images Efficace pour une utilisation dans les z...

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Prix d'origine $149.00 - Prix d'origine $269.00
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Prix actuel $149.00
Prix d'origine $399.00 - Prix d'origine $399.00
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$399.00
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Prix actuel $399.00

Optolong L-Quad Enhance + L-Para L1 Dual-Combo Filter Set - 2"

OPT-L1-SET
3 en stock

L-Quad Enhance Filter: A quad-bandpass filter designed for balanced RGB color from broadband targets. L-Para L1 Filter: A dual-narrowband filter...

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Prix d'origine $399.00 - Prix d'origine $399.00
Prix d'origine
$399.00
$399.00 - $399.00
Prix actuel $399.00

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.