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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

CA$72.00 - CA$72.00
CA$72.00
CA$72.00 - CA$72.00
CA$72.00

SBIG Adaptateur pour Filtres - 36mm à 1.25"

DL-10105

Inserts individuels permettant l'utilisation de filtres de 1,25″ dans des cellules filetées à la place de filtres non montés de 36 mm dans les rou...

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CA$72.00 - CA$72.00
CA$72.00
CA$72.00 - CA$72.00
CA$72.00
CA$1,709.00 - CA$1,709.00
CA$1,709.00
CA$1,709.00 - CA$1,709.00
CA$1,709.00

SBIG FW8-8300 pour STF

DL-FW8-8300

Compatible avec: Caractéristiques Pouvoir 12 Vcc Interface informatique I2C Compatibilité du système d'exploitation Système ...

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CA$1,709.00 - CA$1,709.00
CA$1,709.00
CA$1,709.00 - CA$1,709.00
CA$1,709.00
CA$519.00 - CA$519.00
CA$519.00
CA$519.00 - CA$519.00
CA$519.00

SBIG Couvercle Standard pour FW8-Aluma

DL-FW8-ALUMA-STD-COVER

Couvercle avant standard pour roue à filtres Aluma - remplace le couvercle avant autoguidé lorsqu'une distance minimale de mise au point arrière e...

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CA$519.00 - CA$519.00
CA$519.00
CA$519.00 - CA$519.00
CA$519.00
CA$520.00 - CA$520.00
CA$520.00
CA$520.00 - CA$520.00
CA$520.00

SBIG Couvercle Standard FW8-STXL

DL-FW8-STXL-STD-COVER

Capot avant standard pour roue à filtres STXL - remplace le capot avant autoguidé pour une utilisation avec les adaptateurs d'objectif de caméra.

CA$520.00 - CA$520.00
CA$520.00
CA$520.00 - CA$520.00
CA$520.00
CA$2,829.00 - CA$2,829.00
CA$2,829.00
CA$2,829.00 - CA$2,829.00
CA$2,829.00

SBIG Roue à Filtres STX 5x65mm Carrés

DL-FW5-STX

Commande spéciale seulement. Caractéristiques Interface informatique I2C Compatibilité du système d'exploitation Système d'exploitat...

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CA$2,829.00 - CA$2,829.00
CA$2,829.00
CA$2,829.00 - CA$2,829.00
CA$2,829.00
CA$2,689.00 - CA$2,689.00
CA$2,689.00
CA$2,689.00 - CA$2,689.00
CA$2,689.00

SBIG Roue à Filtres STX 7x50mm Carrés

DL-FW7-STX

Le SBIG FW7-STX est une roue à filtres carrée de 50 mm à 7 positions pour les caméras des séries STX et Aluma AC. Le SBIG FW7-STX est une roue à fi...

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CA$2,689.00 - CA$2,689.00
CA$2,689.00
CA$2,689.00 - CA$2,689.00
CA$2,689.00
CA$2,130.00 - CA$2,130.00
CA$2,130.00
CA$2,130.00 - CA$2,130.00
CA$2,130.00

SBIG Roue à Filtres STXL 8x36mm

DL-FW8S-STXL

Le SBIG FW8S-STXL fournit 8 emplacements de filtre pour tous les modèles de caméras SBIG STXL. Caractéristiques Taille du filtre 36mm / 1.2...

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CA$2,130.00 - CA$2,130.00
CA$2,130.00
CA$2,130.00 - CA$2,130.00
CA$2,130.00
CA$65.00 - CA$65.00
CA$65.00
CA$65.00 - CA$65.00
CA$65.00

SBIG Cellule de Filtre 1.25" avec Dispositif de Retenue pour Filtres Non Montés de 1.1"

DL-50045

Il s'agit d'une cellule filtrante à visser de 1,25″ pour les filtres en verre standard non montés de 1,1″. La cellule comprend une bague de retenu...

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CA$65.00 - CA$65.00
CA$65.00
CA$65.00 - CA$65.00
CA$65.00
CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00

Plaques coulissantes de filtre modulaire Starizona

STZ-MFS-PLATE-54M
3 en stock

Plaques coulissantes de filtre modulaire Starizona

CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
CA$126.00 - CA$126.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00

Starizona RASA 8 Filter Holder - M42 Threads

STZ-RASA8-FH

The RASA 8 Filter Holder allows the use of 2" filters on Celestron's RASA 8" telescope with a camera using M42 threads and having a 17.5mm backfoc...

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CA$126.00 - CA$126.00
CA$126.00
CA$126.00 - CA$126.00
CA$126.00
SVBONY CLS Light Pollution Filter
CA$31.00 - CA$74.00
CA$31.00 - CA$74.00
CA$31.00 - CA$74.00
CA$31.00

SVBONY CLS Light Pollution Broadband Filter

Options available

Broadband Light Pollution Suppression Effectively Blocks Sodium and Mercury Vapor Streetlights High Transmission on Key Nebula Emission Lines Opti...

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CA$31.00 - CA$74.00
CA$31.00 - CA$74.00
CA$31.00 - CA$74.00
CA$31.00
SVBONY Linear Polarizer Filter
CA$17.00 - CA$22.00
CA$17.00 - CA$22.00
CA$17.00 - CA$22.00
CA$17.00

SVBONY Linear Polarizer Filter

Options available

Reduces light transmission to a comfortable 13% for lunar viewing Standard 1.25-inch barrel size fits most eyepieces and accessories Threads into ...

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CA$17.00 - CA$22.00
CA$17.00 - CA$22.00
CA$17.00 - CA$22.00
CA$17.00
SVBONY Moon Filter
CA$16.00 - CA$20.00
CA$16.00 - CA$20.00
CA$16.00 - CA$20.00
CA$16.00

SVBONY Moon Filter

Options available

Reduces glare for comfortable lunar and planetary observing Fits any standard 1.25" eyepiece or accessory Standard M28.5x0.6 filter threads Enhanc...

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CA$16.00 - CA$20.00
CA$16.00 - CA$20.00
CA$16.00 - CA$20.00
CA$16.00
SVBONY SV115 OIII 18nm Narrowband Filter
CA$64.00 - CA$78.00
CA$64.00 - CA$78.00
CA$64.00 - CA$78.00
CA$64.00

SVBONY SV115 18nm OIII Narrowband Filter

Options available
3 variants in stock

2-inch diameter filter for standard eyepieces and accessories 18nm bandpass isolates key Oxygen-III emission lines 90% peak transmittance at 495.9...

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CA$64.00 - CA$78.00
CA$64.00 - CA$78.00
CA$64.00 - CA$78.00
CA$64.00
SVBONY SV128 Variable Polarizing Filter
CA$25.00 - CA$27.00
CA$25.00 - CA$27.00
CA$25.00 - CA$27.00
CA$25.00

SVBONY SV128 Variable Polarizing Filter

Options available
7 variants in stock

Available in 1.25" and 2" barrel sizes Continuously variable light transmission Reduces glare for enhanced lunar and planetary contrast Constructe...

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CA$25.00 - CA$27.00
CA$25.00 - CA$27.00
CA$25.00 - CA$27.00
CA$25.00
SVBONY SV132 H-Beta 25nm Narrowband Filter
CA$66.00 - CA$73.00
CA$66.00 - CA$73.00
CA$66.00 - CA$73.00
CA$66.00

SVBONY SV132 25nm H-Beta Narrowband Filter

Options available
4 variants in stock

Targets the 486nm Hydrogen-Beta emission line 25nm bandpass for enhanced contrast 80% peak transmittance at the H-Beta wavelength Blocks Mercury (...

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CA$66.00 - CA$73.00
CA$66.00 - CA$73.00
CA$66.00 - CA$73.00
CA$66.00
SVBONY SV133 1.25" 5-Position Filter Wheel
CA$68.00 - CA$68.00
CA$68.00
CA$68.00 - CA$68.00
CA$68.00

SVBONY SV133 5-Position Filter Wheel - 1.25"

SV-W9103A

Accommodates five standard 1.25" threaded filters Manual wheel with precise click-stop positioning T2-threaded connections for direct camera attac...

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CA$68.00 - CA$68.00
CA$68.00
CA$68.00 - CA$68.00
CA$68.00
SVBONY SV133 2" 5-Position Filter Wheel for Deep Sky Astrophotography
CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00

SVBONY SV133 5-Position Filter Wheel - 2"

SV-W9103B

Accommodates five 2-inch filters 2-inch barrel for telescope connection 2-inch eyepiece and camera compatibility Enables rapid filter changes duri...

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CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00
SVBONY SV139 1.25" ND0.6 Neutral Density Moon Filter
CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00

SVBONY SV139 ND0.6 Neutral Density Moon Filter - 1.25"

SV-W9108A

Reduces lunar glare with a fixed ND0.6 optical density Transmits a neutral 25% of incoming light Standard 1.25-inch barrel fits most eyepieces Mul...

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CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
SVBONY SV139 1.25" ND0.9 Neutral Density Moon Filter
CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00

SVBONY SV139 ND0.9 Neutral Density Moon Filter - 1.25"

SV-W9108B

Reduces lunar brightness by ~87.5% (ND0.9) Fits any standard 1.25-inch eyepiece or accessory Neutral density filter preserves true color balance F...

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CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
SVBONY SV139 1.25" ND1.2 Neutral Density Moon Filter
CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00

SVBONY SV139 ND1.2 Neutral Density Moon Filter - 1.25"

SV-W9108C

Reduces Lunar Glare with ND1.2 Density Transmits 6.25% of Incoming Light Standard 1.25-inch Barrel Threads Fully Multi-Coated Optical Glass Neutra...

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CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00
SVBONY SV139 1.25" ND3.0 Neutral Density Moon Filter
CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00

SVBONY SV139 ND3.0 Neutral Density Moon Filter - 1.25"

SV-W9108D

ND3.0 Neutral Density Filter Standard 1.25-inch Barrel Size Transmits 0.1% of Incoming Light (10-Stop / 1000× Reduction) Ideal for Herschel Solar ...

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CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00
SVBONY SV155 1.25 inch 7-Piece Telescope Filter Set
CA$38.00 - CA$38.00
CA$38.00
CA$38.00 - CA$38.00
CA$38.00

SVBONY SV155 7-Piece Telescope Filter Set - 1.25"

SV-F9135A
2 en stock

7-Piece Filter Set Includes Moon, CPL, and 5 Color Filters Standard 1.25-inch Barrel Size M28.5*0.6 Filter Threads 2mm Thick Optical Glass Desc...

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CA$38.00 - CA$38.00
CA$38.00
CA$38.00 - CA$38.00
CA$38.00
SVBONY SV164 Dark Filter for CCD/CMOS Cameras
CA$16.00 - CA$19.00
CA$16.00 - CA$19.00
CA$16.00 - CA$19.00
CA$16.00

SVBONY SV164 Dark Filter for CCD and CMOS Cameras

Options available
10 variants in stock

2-inch Filter Size Standard M48x0.75 Threads Enables Automated Dark Frame Capture 1mm Filter Thickness Durable Anodized Aluminum Cell Descripti...

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CA$16.00 - CA$19.00
CA$16.00 - CA$19.00
CA$16.00 - CA$19.00
CA$16.00

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.