Passer au contenu
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

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

$775.00 - $3,350.00
$775.00 - $3,350.00
$775.00 - $3,350.00
$775.00

Chroma Ensemble de Filtres HaLRVB

Options available

Ensemble de filtres d'astronomie H-alpha, Luminance, Rouge, Vert et Bleu 8nm Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins ...

Afficher tous les détails
$775.00 - $3,350.00
$775.00 - $3,350.00
$775.00 - $3,350.00
$775.00
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00

Chroma Filtre I-Bessel

Options available

Filtre photométrique NIR de la série UVBRI Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraînant des dist...

Afficher tous les détails
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00
$275.00 - $790.00
$275.00 - $790.00
$275.00 - $790.00
$275.00

Chroma Filtre Jovian Methane

Options available

Filtre à bande d'absorption du méthane. Ce filtre améliore le contraste lors de l'imagerie d'objets contenant des niveaux importants de méthane. L...

Afficher tous les détails
$275.00 - $790.00
$275.00 - $790.00
$275.00 - $790.00
$275.00
$275.00 - $550.00
$275.00 - $550.00
$275.00 - $550.00
$275.00

Chroma Filtre LoGlow

Options available

Bloque les lignes spectrales communes des sources d'éclairage. Ce filtre fournit une couleur équilibrée pour le spectre visible tout en bloquant l...

Afficher tous les détails
$275.00 - $550.00
$275.00 - $550.00
$275.00 - $550.00
$275.00
$525.00 - $1,925.00
$525.00 - $1,925.00
$525.00 - $1,925.00
$525.00

Chroma Ensemble de Filtres LRVB

Options available

Ensemble de filtres d'astronomie de luminance, rouge, vert et bleu Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de ref...

Afficher tous les détails
$525.00 - $1,925.00
$525.00 - $1,925.00
$525.00 - $1,925.00
$525.00
$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00

Chroma Filtre Luminance

Options available

Filtre de luminance pour améliorer le rendu des couleurs avec le jeu RVB Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas ...

Afficher tous les détails
$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00

Chroma Filtre OIII - 3nm

Options available

Les filtres OIII de Chroma isolent la ligne d'émission primaire de 500,7 nm d'oxygène doublement ionisé. Après H-alpha, c'est la prochaine émissio...

Afficher tous les détails
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00

Chroma Filtre OIII - 5nm

Options available

Les filtres OIII de Chroma isolent la ligne d'émission primaire de 500,7 nm d'oxygène doublement ionisé. Après H-alpha, c'est la prochaine émissio...

Afficher tous les détails
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00
$275.00 - $830.00
$275.00 - $830.00
$275.00 - $830.00
$275.00

Chroma Filtre OIII - 8nm

Options available

Les filtres OIII de Chroma isolent la ligne d'émission primaire de 500,7 nm d'oxygène doublement ionisé. Après H-alpha, c'est la prochaine émissio...

Afficher tous les détails
$275.00 - $830.00
$275.00 - $830.00
$275.00 - $830.00
$275.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00

Chroma Filtre OIII Optimisé pour f/3 - 3nm

Options available

Les filtres OIII de Chroma isolent la ligne d'émission primaire de 500,7 nm d'oxygène doublement ionisé. Après H-alpha, c'est la prochaine émissio...

Afficher tous les détails
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00

Chroma Filtre R-Bessel

Options available

Filtre photométrique rouge de la série UVBRI Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraînant des di...

Afficher tous les détails
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00
$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00

Chroma Filtre Rouge

Options available

Filtre rouge pour le rendu des couleurs avec jeu RVB Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraînan...

Afficher tous les détails
$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00

Chroma Filtre SII - 3nm

Options available

Les filtres SII isolent l'émission spectrale d'atomes de soufre ionisés individuellement, également courants dans les nébuleuses. L'émission se fa...

Afficher tous les détails
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00

Chroma Filtre SII - 5nm

Options available

Les filtres SII isolent l'émission spectrale d'atomes de soufre ionisés individuellement, également courants dans les nébuleuses. L'émission se fa...

Afficher tous les détails
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00 - $1,380.00
$460.00
$275.00 - $830.00
$275.00 - $830.00
$275.00 - $830.00
$275.00

Chroma Filtre SII - 8nm

Options available

Les filtres SII isolent l'émission spectrale d'atomes de soufre ionisés individuellement, également courants dans les nébuleuses. L'émission se fa...

Afficher tous les détails
$275.00 - $830.00
$275.00 - $830.00
$275.00 - $830.00
$275.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00

Chroma Filtre SII Optimisé pour f/3 - 3nm

Options available

Les filtres SII isolent l'émission spectrale d'atomes de soufre ionisés individuellement, également courants dans les nébuleuses. L'émission se fa...

Afficher tous les détails
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00

Chroma Filtre U-Bessel

Options available

Filtre photométrique UV de la série UVBRI Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraînant des disto...

Afficher tous les détails
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00
$1,175.00 - $3,425.00
$1,175.00 - $3,425.00
$1,175.00 - $3,425.00
$1,175.00

Ensemble de filtres Chroma UBVRI

Options available

Jeu de filtres UBVRI pour l'imagerie photométrique Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraînant ...

Afficher tous les détails
$1,175.00 - $3,425.00
$1,175.00 - $3,425.00
$1,175.00 - $3,425.00
$1,175.00
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00

Chroma Filtre V-Bessel

Options available

Filtre photométrique vert (Visible) de la série UVBRI Filtres conçus pour être utilisés avec CCD et pour f/4.0 ou moins Pas de reflets entraîna...

Afficher tous les détails
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00
Épuisé
$34.99 - $34.99
$34.99
$34.99 - $34.99
$34.99

David Astro Planetary Color Filter Kit with Case - 1.25"

DAV-CF-1.25

Filter No.12 Filter No.21 Filter No.23A Filter No.56 Filter No.82 Moon & Sky filter

$34.99 - $34.99
$34.99
$34.99 - $34.99
$34.99
Épuisé
$20.41 - $20.41
$20.41
$20.41 - $20.41
$20.41

David Astro Variable Polarizing Filter - 1.25"

DAV-VPOL-1.25
4 restant!

The Variable Polarizing Filter is an essential tool for astronomical observing, designed to enhance your viewing experience by reducing glare and c...

Afficher tous les détails
$20.41 - $20.41
$20.41
$20.41 - $20.41
$20.41
$109.99 - $119.99
$109.99 - $119.99
$109.99 - $119.99
$109.99

Explore Scientific Filtre pour Nébuleuses CLS - 1.25"

Options available

Explore Scientific Nebula Filtre CLS - 1,25"

$109.99 - $119.99
$109.99 - $119.99
$109.99 - $119.99
$109.99
$119.99 - $119.99
$119.99
$119.99 - $119.99
$119.99

Explore Scientific Filtre pour Nébuleuses CLS - 2.0"

ES-310220

Explore Scientific Nebula Filtre CLS - 2.0"

$119.99 - $119.99
$119.99
$119.99 - $119.99
$119.99
$129.99 - $129.99
$129.99
$129.99 - $129.99
$129.99

Explore Scientific Filtre pour Nébuleuses H-Beta - 1.25"

ES-310235

Filtre de nébuleuse Explore Scientific H-Beta - 1,25"

$129.99 - $129.99
$129.99
$129.99 - $129.99
$129.99

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.