Passer au contenu

Filtres

A filter decides what light reaches your sensor or your eye, and under Canadian suburban skies that decision often matters more than aperture. The right narrowband filter can make a nebula imageable from a driveway that visually shows almost nothing. David Astro carries filters in Canada — narrowband, LRGB, light pollution, planetary, solar and scientific — in 1.25", 2", 31 mm, 36 mm and unmounted formats, shipped from Canadian stock.

Filter selection is where our team spends a lot of time, because bandwidth, f-ratio and sensor size interact in ways that are not obvious from a product page. Tell us your telescope and camera and we will recommend a set that works together.

Filtres

SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"
CA$235.00 - CA$235.00
CA$235.00
CA$235.00 - CA$235.00
CA$235.00

SVBONY SV227 SHO 5nm H-Alpha OIII SII Narrowband Filter Set - 1.25"

SV-W9187A

Complete 1.25-inch SHO (SII, H-Alpha, OIII) filter set Tight 5nm bandpass for high-contrast imaging Peak transmission rate of ≥90% at key waveleng...

Afficher tous les détails
CA$235.00 - CA$235.00
CA$235.00
CA$235.00 - CA$235.00
CA$235.00
SVBONY SV227 SII 5nm Narrowband Filter - 2"
SVBONY SV227 SII 5nm Narrowband Filter - 2"
CA$131.00 - CA$131.00
CA$131.00
CA$131.00 - CA$131.00
CA$131.00

SVBONY SV227 SII 5nm Narrowband Filter - 2"

SV-W9187DA

Captures Sulfur-II (SII) emission at a 672nm center wavelength Extremely narrow 5nm bandpass for maximum contrast Peak light transmission of ≥90% ...

Afficher tous les détails
CA$131.00 - CA$131.00
CA$131.00
CA$131.00 - CA$131.00
CA$131.00
SVBONY SV231 Fringe Killer Color Correction Filter
CA$43.00 - CA$56.00
CA$43.00 - CA$56.00
CA$43.00 - CA$56.00
CA$43.00

SVBONY SV231 Fringe Killer Color Correction Filter

Options available

Reduces violet fringing (chromatic aberration) in achromatic refractors Standard 1.25" filter threads for universal compatibility Blocks IR wavele...

Afficher tous les détails
CA$43.00 - CA$56.00
CA$43.00 - CA$56.00
CA$43.00 - CA$56.00
CA$43.00
CA$126.00 - CA$168.00
CA$126.00 - CA$168.00
CA$126.00 - CA$168.00
CA$126.00

SVBONY SV240 Near-Infrared Multi-Narrowband Light Pollution Filter

Options available

Designed for urban astrophotography with one-shot color cameras Passes H-Alpha, OIII, H-Beta, and Near-Infrared (NIR) wavelengths Peak transmittan...

Afficher tous les détails
CA$126.00 - CA$168.00
CA$126.00 - CA$168.00
CA$126.00 - CA$168.00
CA$126.00
SVBONY SV260 5-Bandpass Light Pollution Filter - 2"
SVBONY SV260 5-Bandpass Light Pollution Filter - 2"
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00

SVBONY SV260 5-Bandpass Light Pollution Filter - 2"

SV-W9194A

5-Bandpass broadband light pollution filter 2-inch size with M48x0.75 thread Over 90% peak transmittance for high signal OD4 blocking of key light...

Afficher tous les détails
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00
SVBONY UHC Light Pollution Filter
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00

SVBONY UHC Ultra High Contrast Light Pollution Filter

Options available

Reduces light pollution from artificial lighting Enhances contrast for emission nebulae Available in 1.25", 2", and Canon EOS-C formats Durable al...

Afficher tous les détails
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00
SVBONY UV IR-Cut Telescope Filter
CA$22.00 - CA$25.00
CA$22.00 - CA$25.00
CA$22.00 - CA$25.00
CA$22.00

SVBONY UV IR-Cut Filter

Options available
9 variants in stock

Blocks unwanted Ultraviolet (UV) and Infrared (IR) wavelengths Standard 2-inch filter threads for wide compatibility Improves image contrast and c...

Afficher tous les détails
CA$22.00 - CA$25.00
CA$22.00 - CA$25.00
CA$22.00 - CA$25.00
CA$22.00
Tele Vue BandMate H-Beta Filter
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00

Tele Vue BandMate H-Beta Filter

Options available

Filter Type: Hydrogen-Beta (Hβ) Narrowband Available Sizes: 1.25" and 2" Mounted Primary Targets: Horsehead Nebula, California Nebula Manufacturin...

Afficher tous les détails
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00

Tele Vue BandMate Nebustar Filter

Options available
1 variants in stock

Unique Narrowband Design: Transmits both Hβ and OIII emission lines in a single, targeted passband for maximum contrast. Blocks Red Wavelengths:...

Afficher tous les détails
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00 - CA$450.00
CA$204.00
Tele Vue BandMate OIII Filter
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00

Tele Vue BandMate OIII Filter

Options available

Isolates doubly ionized oxygen (OIII) emission lines Dramatically increases contrast on planetary nebulae and supernova remnants Manufactured by A...

Afficher tous les détails
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00 - CA$364.00
CA$200.00
Wanderer Astro ND Filter for WandererCover
CA$7.00 - CA$13.00
CA$7.00 - CA$13.00
CA$7.00 - CA$13.00
CA$7.00

Wanderer Astro ND Filter for WandererCover

Options available

Available in 7 sizes from 80mm to 240mm Designed for WandererCover V4-EC and V4-EC IR Enables Calibrated Flat Frames with Sensitive Cameras Reduce...

Afficher tous les détails
CA$7.00 - CA$13.00
CA$7.00 - CA$13.00
CA$7.00 - CA$13.00
CA$7.00
CA$660.00 - CA$660.00
CA$660.00
CA$660.00 - CA$660.00
CA$660.00

William Optics Filtre Bande Étroite STC Astro Duo

WO-YF-STC-ADN

Filtre passe-bande double pour l'astrophotographie Optimisé pour les raies d'émission H-alpha et OIII Description ...

Afficher tous les détails
CA$660.00 - CA$660.00
CA$660.00
CA$660.00 - CA$660.00
CA$660.00
CA$328.00 - CA$328.00
CA$328.00
CA$328.00 - CA$328.00
CA$328.00

William Optics Filtre Multispectre STC Ultra Layer Astro - 48mm

WO-YF-STC-M48

Filtre passe-bande multi pour l'astrophotographie Conception filetée de 48 mm pour une fixation facile Description ...

Afficher tous les détails
CA$328.00 - CA$328.00
CA$328.00
CA$328.00 - CA$328.00
CA$328.00
CA$26.00 - CA$69.00
CA$26.00 - CA$69.00
CA$26.00 - CA$69.00
CA$26.00

ZWO Fenêtre de Protection AR

Options available
5 variants in stock

Fenêtre de protection AR Fenêtre de protection ZWO D21 AR Paramètre technique: Diamètre : 21 mm Type : fenêtre AR Épaisseur : 1,1 mm Plan...

Afficher tous les détails
CA$26.00 - CA$69.00
CA$26.00 - CA$69.00
CA$26.00 - CA$69.00
CA$26.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

ZWO Filtre Méthane CH4 - 20nm 1.25"

ZWO-CH4
3 en stock

Le filtre à bande ZWO Methane (CH4) est un filtre spécial pour une utilisation photographique. Son FWHM est de 20 nm, ce qui convient à la plupa...

Afficher tous les détails
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$239.00
CA$139.00 - CA$239.00
CA$139.00 - CA$239.00
CA$139.00

ZWO Filtre Duo-Band

Options available
7 variants in stock

Le filtre ZWO Duo-Band est un filtre double bande étroite principalement destiné à compléter notre gamme de caméras ASI couleur. Le filtre Duo-Ban...

Afficher tous les détails
CA$139.00 - CA$239.00
CA$139.00 - CA$239.00
CA$139.00 - CA$239.00
CA$139.00
CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00

ZWO Filtre Passe-Bande IR 850nm - 1.25"

ZWO-850IR1-25
2 en stock

Filtre de passage ZWO 1.25″ IR 850nm adapté aux caméras sensibles aux infrarouges. Vous n'avez pas besoin de débayer et d'obtenir la pleine résolut...

Afficher tous les détails
CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00

ZWO Fenêtre de Protection IR-Cut

Options available
1 variants in stock

Fenêtre de protection UV IR-CUT Fenêtre de protection ZWO D21 UV IR-CUT Paramètre technique: Diamètre : 21 mm Type: fenêtre UV IR-cut Épai...

Afficher tous les détails
CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00
CA$207.00 - CA$419.00
CA$207.00 - CA$419.00
CA$207.00 - CA$419.00
CA$207.00

Filtres optimisés ZWO LRGB

Options available
3 variants in stock

Les nouveaux filtres ZWO LRGB sont conçus pour égaliser approximativement le flux du capteur mono ASI1600 Meilleure transmission, meilleur revête...

Afficher tous les détails
CA$207.00 - CA$419.00
CA$207.00 - CA$419.00
CA$207.00 - CA$419.00
CA$207.00
CA$517.00 - CA$979.00
CA$517.00 - CA$979.00
CA$517.00 - CA$979.00
CA$517.00

ZWO Ensemble de Filtres à Bande Étroite - 7nm H-alpha, OIII et SII

Options available
1 variants in stock

Le filtre à bande étroite n'élimine pas les effets de la pollution lumineuse et n'augmente pas la luminosité de l'objet. Dans de nombreux cas, ils ...

Afficher tous les détails
CA$517.00 - CA$979.00
CA$517.00 - CA$979.00
CA$517.00 - CA$979.00
CA$517.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00

ZWO Filtre H-alpha - 7nm

Options available

Le filtre à bande étroite n'élimine pas les effets de la pollution lumineuse et n'augmente pas la luminosité de l'objet. Dans de nombreux cas, ils ...

Afficher tous les détails
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00

ZWO Filtre OIII - 7nm

Options available
2 variants in stock

Le filtre à bande étroite n'élimine pas les effets de la pollution lumineuse et n'augmente pas la luminosité de l'objet. Dans de nombreux cas, ils...

Afficher tous les détails
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00

ZWO Filtre SII - 7nm

Options available
2 variants in stock

Le filtre à bande étroite n'élimine pas les effets de la pollution lumineuse et n'augmente pas la luminosité de l'objet. Dans de nombreux cas, ils...

Afficher tous les détails
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00 - CA$349.00
CA$181.00
CA$40.00 - CA$69.00
CA$40.00 - CA$69.00
CA$40.00 - CA$69.00
CA$40.00

ZWO Filtre UV/IR CUT

Options available
40 variants in stock

Le filtre ZWO IR UV CUT convient aux caméras couleur avec fenêtre de protection AR. Le filtre ZWO IR-Cut empêche la lumière infrarouge d'atteindr...

Afficher tous les détails
CA$40.00 - CA$69.00
CA$40.00 - CA$69.00
CA$40.00 - CA$69.00
CA$40.00

Filter Types and When Each One Earns Its Place

Filters do not add signal. They remove unwanted light so that the signal you want has better contrast against the background. Choosing well means knowing which unwanted light you are fighting.

  • Narrowband filters: Ha, OIII and SII passbands, typically 3 to 12 nm. Narrower bands reject more light pollution and moonlight but demand accurate focus and longer exposures.
  • LRGB filter sets: Parfocal luminance, red, green and blue for colour imaging with monochrome sensors, with the luminance channel carrying most of the detail.
  • Light pollution filters: Broadband rejection of mercury and sodium emission lines. Effective against older street lighting and much less effective against broad-spectrum LED.
  • Planetary and colour filters: Wratten-standard colour filters that raise contrast on specific planetary features — a red or orange filter on Mars, blue on Jupiter's belts.
  • Solar filters: Full-aperture white-light filters for safe observation of sunspots and transits.
  • Neutral density and polarizing: Variable brightness reduction for lunar observing without altering colour balance.

Why Choose David Astro for Filters

A filter that performs beautifully at f/7 can produce a shifted passband and soft results at f/3. That is the kind of detail worth asking about before ordering.

  • F-ratio matched recommendations: Narrowband passbands shift blueward in fast optical systems, so we recommend filters specified for your focal ratio rather than the narrowest available.
  • Sensor size and vignetting: We size filters to your sensor diagonal and filter wheel placement, so an undersized filter does not clip your corners.
  • Spacing accounted for: Filter glass shifts focus by roughly a third of its thickness, and we include that in the back-focus calculation we provide.
  • Authorized dealer: Genuine filters with full manufacturer warranty and verified coatings, in Canadian inventory and shipped domestically.
  • Ships from Canada: No duties or brokerage charges for Canadian buyers.

Filters in Canada — Frequently Asked Questions

Do light pollution filters still work under LED streetlights?
Much less well than they did under sodium lighting. LED emits across a broad spectrum, so there is no narrow band to reject. Narrowband filters remain effective because they pass only emission lines regardless of what the streetlight does.
How narrow should my Ha filter be?
For f/5 and slower, 3 to 5 nm gives excellent contrast. Below about f/4, the incident light cone shifts the passband and a 6 to 7 nm filter, or one specified for fast optics, performs better.
What size filters do I need?
Match the sensor diagonal plus the distance from filter to sensor. A 36 mm filter typically covers APS-C in a standard wheel; full frame usually needs 50 mm square or unmounted 2 inch.
Are filters shipped from Canada?
Yes, in-stock filters are held in our Canadian warehouse and reach Canadian customers without customs handling.

Building a filter set?

Tell us your telescope, camera and sky conditions and we will recommend the right bandwidths and sizes. Canadian stock, fast domestic shipping.