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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

Baader Planetarium Baader S-II 1.25" f/2 Ultra-Highspeed-Filter (4nm) – CMOS-optimized
$324.00 - $671.00
$324.00 - $671.00
$324.00 - $671.00
$324.00

Baader Planetarium S-II f/2 Ultra-Highspeed-Filter (4nm) – CMOS-optimized

Options available

4nm FWHM Bandpass for Sulfur-II (S-II) Engineered for f/2 Ultra-Highspeed Optical Systems Available in 1.25" & 2" Mounted, 31mm, 36mm, 50.4mm ...

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$324.00 - $671.00
$324.00 - $671.00
$324.00 - $671.00
$324.00
Baader Planetarium Baader S-II 1.25" f/3 Ultra-Highspeed-Filter (4nm) – CMOS-optimized
$324.00 - $660.00
$324.00 - $660.00
$324.00 - $660.00
$324.00

Baader Planetarium S-II f/3 Ultra-Highspeed-Filter (4nm) – CMOS-optimized

Options available

4nm Bandwidth (FWHM) Pre-Shifted for Fast f/3 Optical Systems Available in 1.25" & 2" Mounted, 31mm, 36mm & 50.4mm Unmounted Round, and 50...

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$324.00 - $660.00
$324.00 - $660.00
$324.00 - $660.00
$324.00
Baader Planetarium Baader S-II 1.25" Ultra-Narrowband-Filter (4nm) – CMOS-optimized
$324.00 - $694.00
$324.00 - $694.00
$324.00 - $694.00
$324.00

Baader Planetarium S-II Ultra-Narrowband-Filter (4nm) – CMOS-optimized

Options available

4nm Full-Width Half-Maximum (FWHM) Bandpass Optimized for Modern CMOS Sensors Available in 1.25" (M28.5 x 0.6) & 2" Mounted, 31mm, 36mm & ...

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$324.00 - $694.00
$324.00 - $694.00
$324.00 - $694.00
$324.00
Baader Planetarium UFC Protection – Dark-Slider, 3D-printed
$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00

Baader Planetarium UFC Protection – Dark-Slider, 3D-printed

BAA-2459197

3D-printed dark slider (STL files also free to download) Designed for the Baader UFC System Creates a light-tight dark slide Essential for dark fr...

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$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00
Baader Planetarium UFC Protection – Slider-Seal, 3D-printed
$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00

Baader Planetarium UFC Protection – Slider-Seal, 3D-printed

BAA-2459196

3D-printed UFC seal (STL files also free to download) Designed for the Baader Planetarium UFC System Closes the UFC slider opening against dust an...

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$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00
Baader Planetarium UFC S70 Base Connector – Optical height: 2 mm
$46.00 - $46.00
$46.00
$46.00 - $46.00
$46.00

Baader Planetarium UFC S70 Base Connector – Optical height: 2 mm

BAA-2459124

Connects multiple Baader UFC filter bases Adds only 2 mm of optical height to the imaging train Provides a camera-side S70 dovetail co...

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$46.00 - $46.00
$46.00
$46.00 - $46.00
$46.00
Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm
$447.00 - $447.00
$447.00
$447.00 - $447.00
$447.00

Baader Planetarium UHC-L / Ultra-L-Booster Filter 65x65mm

BAA-2961566

65x65mm Unmounted Square Format Optimized for LED Light Pollution Rejection High-Contrast Views of Emission Nebulae Ideal Complement to Narrowband...

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$447.00 - $447.00
$447.00
$447.00 - $447.00
$447.00
Baader Planetarium FCCT Filter – UV/IR-Cut / L-Filter 2" unmounted (Ø 47,4 mm) – CMOS-optimized
$91.00 - $324.00
$91.00 - $324.00
$91.00 - $324.00
$91.00

Baader Planetarium UV/IR-Cut / L-Filter – CMOS-optimized

Options available

Serves as a high-transmission Luminance (L) filter Provides complete Ultraviolet (UV) and Infrared (IR) blocking Engineered with CMOS-optimized an...

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$91.00 - $324.00
$91.00 - $324.00
$91.00 - $324.00
$91.00
$109.00 - $154.00
$109.00 - $154.00
$109.00 - $154.00
$109.00

Baader Filtre Polarisant - Double

Options available
2 variants in stock

Baader Double Filtre Polarisant Se visse dans des oculaires/filetages de 1¼ ou 2". Les deux filtres peuvent être tournés l'un par rapport à l'autr...

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$109.00 - $154.00
$109.00 - $154.00
$109.00 - $154.00
$109.00
$61.00 - $93.00
$61.00 - $93.00
$61.00 - $93.00
$61.00

Baader Filtre Polarisant - Simple

Options available
2 variants in stock

Filtre Polarisant Baader Se visse dans des oculaires/filetages de 1¼ ou 2". Utile dans les observations lunaires et solaires pour limiter la lumi...

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$61.00 - $93.00
$61.00 - $93.00
$61.00 - $93.00
$61.00
$106.00 - $190.00
$106.00 - $190.00
$106.00 - $190.00
$106.00

Baader Filtre Semi-APO

Options available

Deux filtres en un pour une luminosité maximale Combine Fringe-Killer avec Moon & Skyglow pour un contraste semi-APO avec réfracteurs Bords...

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$106.00 - $190.00
$106.00 - $190.00
$106.00 - $190.00
$106.00
$11.50 - $11.50
$11.50
$11.50 - $11.50
$11.50

Baader Boîte de Filtre Empilable

BAA-2459253
2 en stock

Baader-Filterbox pour filtres jusqu'à 65 x 65 mm Pour mettre à niveau vos filtres existants : depuis env. 2010 inclus dans la livraison de tous...

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$11.50 - $11.50
$11.50
$11.50 - $11.50
$11.50
$332.00 - $434.00
$332.00 - $434.00
$332.00 - $434.00
$332.00

Baader Filtre U-Venus - 350nm

Options available
1 variants in stock

Baader U-Filter (Vénus et UV) 350nm. Pic de transmission env. 80% à 350nm, bande passante 60nm (320-380nm), bloquant complètement toute la gamm...

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$332.00 - $434.00
$332.00 - $434.00
$332.00 - $434.00
$332.00
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00

Baader Tiroir à Filtre UFC AUX - Filtre D 31mm (requiert UFC-RD50)

BAA-2459151

Baader UFC 31 mm AUX-Filtre-Holder Accepte les filtres ronds non montés de 31 mm Nécessite 1 curseur UFC-RD50 (2459113) Se monte dans le curse...

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$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00

Baader Tiroir à Filtre UFC AUX - Filtre D 36mm (requiert UFC-RD50)

BAA-2459152
1 en stock

Baader UFC 36 mm AUX-Filtre-Holder Accepte les filtres ronds non montés de 36 mm Nécessite 1 curseur UFC-RD50 (2459113) Se monte dans le curse...

Afficher tous les détails
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00

Baader Tiroir à Filtre UFC AUX - 1.25" (Nécessite UFC-RD50)

BAA-2459153
1 en stock

Baader UFC 1¼" AUX-Filter-Holder Accepte les filtres 1¼" montés Nécessite 1 curseur UFC-RD50 (#2459113) Se monte dans le curseur UFC-RD50, qui...

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$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00

Baader Tiroir à Filtre UFC - Filtre Carré 50mm

BAA-2459114

Baader UFC Curseur de filtre / Récipient de filtre 50x50 Accepte les filtres carrés 50x50 mm non montés (jusqu'à 4 mm d'épaisseur) Se glisse da...

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$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00

Baader Tiroir à Filtre UFC - Filtre 2" Monté

BAA-2459112

Baader UFC 2" Curseur de filtre / Conteneur de filtre M48 convient aux filtres 2" (M48) montés sur cellule se glisse dans la base du filtre UFC...

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$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00

Baader Tiroir à Filtre UFC - Filtre Rond Non Monté 50mm

BAA-2459113

Glissière de filtre Baader UFC D50.4 Accepte les filtres ronds non montés de 50,4 mm (pour Filtre-Ø 50,0 mm jusqu'à 50,5 mm) Se glisse dans la ...

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$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
$57.00 - $57.00
$57.00
$57.00 - $57.00
$57.00

Baader Adaptateur UFC Anti Lumière Parasite

BAA-2459121

Baader UFC Straylight-Flange côté télescopique avec plaque de montage pour UFC-Base (vis incluses) côté caméra avec bride de lumière parasite, ...

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$57.00 - $57.00
$57.00
$57.00 - $57.00
$57.00
$119.00 - $320.00
$119.00 - $320.00
$119.00 - $320.00
$119.00

Baader Filtre UHC-S/L-Booster

Options available
6 variants in stock

Le filtre Baader Planetarium UHC-S Nebula excelle dans la fourniture d'une vue à contraste élevé et naturelle de la nébuleuse d'émission - sans gr...

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$119.00 - $320.00
$119.00 - $320.00
$119.00 - $320.00
$119.00
$74.00 - $74.00
$74.00
$74.00 - $74.00
$74.00

Baader Base du Changeur de Filtre Universel (UFC)

BAA-2459110
1 en stock

Base Baader UFC (chambre de filtre) pour curseurs de filtre 2" / 50,4 / 50x50 Côté télescope : avec pince réceptrice à queue d'aronde S70 Côté...

Afficher tous les détails
$74.00 - $74.00
$74.00
$74.00 - $74.00
$74.00
$87.00 - $143.00
$87.00 - $143.00
$87.00 - $143.00
$87.00

Baader UV/IR-CUT/L-Filter optimisé CMOS

Options available
4 variants in stock

Baader Planetarium produit le meilleur filtre anti-UV/IR au monde. son utilisation est devenue la norme de facto pour les imageurs du monde entier...

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$87.00 - $143.00
$87.00 - $143.00
$87.00 - $143.00
$87.00
$109.00 - $189.00
$109.00 - $189.00
$109.00 - $189.00
$109.00

Baader Filtre Visuel de Nébuleuse OIII

Options available

Fournit les vues de contraste les plus élevées absolues de nombreuses nébuleuses diffuses et planétaires. Pour de nombreux objets, le Baader O-III...

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$109.00 - $189.00
$109.00 - $189.00
$109.00 - $189.00
$109.00

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.