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Filters

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.

Filters

$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00

Player One CH4 8nm Filter E-series - 1.25"

POA-CH4-125E

Isolates the 8nm methane (CH4) absorption band Standard 1.25″ filter cell format Optimized for modern CMOS and CCD planetary cameras E-series feat...

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$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Player One Extra Filter Drawer Holder - 1.25"

POA-FD-H1.25
1 in stock

Holds Standard 1.25" Filters M28.5x0.6 Female Threads Compatible with Player One Filter Drawer MAX & MINI Enables Quick Filter Changes Desc...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Player One Extra Filter Drawer Holder - 2"

POA-FD-H2
1 in stock

Holds Standard 2" Mounted Filters M48x0.75 Internal Female Threads Compatible with Player One Filter Drawer MAX Compatible with Player One Filter ...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00

Player One Filter Drawer MAX - 2"

POA-FD-MAX
4 in stock

Securely holds standard 2" mounted filters Robust 3-point locking mechanism prevents tilt and flexure Internal M48x0.75 threads for filter mountin...

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$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00
$139.00 - $139.00
$139.00
$139.00 - $139.00
$139.00

Player One Filter Drawer MINI

POA-FD-MINI
3 in stock

Compact filter drawer system for astrophotography Available in 1.25" and 2" filter sizes Secure metal bead screw locking mechanism prevents tilt D...

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$139.00 - $139.00
$139.00
$139.00 - $139.00
$139.00
Player One Ha 7nm Narrowband Filter S-series – 2"
Player One Ha 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One Ha 7nm Narrowband Filter S-series

Options available

7nm Hydrogen-alpha (Ha) Narrowband Filter Available in 1.25" Threaded Cell and 2" Round Mounted Formats Optimized for Monochrome CMOS/CCD Cameras ...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
Player One IR685nm 1.25″ IR-Pass Filter S-series
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00

Player One IR685nm IR-Pass Filter S-series - 1.25"

POA-IR685

Passes infrared light with wavelengths greater than 685nm Standard 1.25" filter format for broad compatibility Significantly improves image stabil...

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$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Player One IR850nm 1.25″ IR-Pass Filter S-series
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00

Player One IR850nm IR-Pass Filter S-series - 1.25"

POA-IR850

Passes Infrared Light at 850nm Standard 1.25" Filter Size Blocks Visible and Ultraviolet Light High-Quality Optical Glass Substrate Multi-Layer An...

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$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Player One LRGB Filter S-series – 2"
Player One LRGB Filter S-series – 1.25"
$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00

Player One LRGB Filter S-series

Options available

LRGB filter set for monochrome astrophotography Available in 1.25" and 2" sizes (2" round mounted for larger sensors) Constructed from high-qualit...

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$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00
Player One OIII 7nm Narrowband Filter S-series – 2"
Player One OIII 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One OIII 7nm Narrowband Filter S-series

Options available

Oxygen-III (OIII) 7nm Narrowband Filter Available in 1.25" and 2" Sizes for Narrowband Astrophotography High-Transmission, Multi-Layer Coatings Hi...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

Player One Phoenix Filter Wheel - 5x2"

POA-PW5-2
2 in stock

Accommodates five 2-inch mounted filters Automates filter changes for imaging sequences Designed for LRGB and narrowband astrophotography USB conn...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

Player One Phoenix Filter Wheel - 7x36mm

POA-PW7-36
1 in stock

Accommodates 7 x 36mm unmounted filters Enables automated filter sequencing for monochrome cameras Ideal for full LRGB + narrowband imaging setups...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00

Player One Phoenix Filter Wheel - 8×1.25"

POA-PW8-1.25
2 in stock

Holds eight 1.25" mounted filters Automates filter changes for complex imaging sequences Ideal for LRGB, SHO, and other multi-filter palettes USB ...

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$299.00 - $299.00
$299.00
$299.00 - $299.00
$299.00
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00

Player One Phoenix Filter Wheel -7x2"

POA-PW7-2
1 in stock

Holds seven 2-inch mounted filters Automates filter changes for unattended imaging Ideal for LRGB and narrowband palettes Designed for cameras wit...

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$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00

Player One Phoenix Filter Wheel -7x50mm

POA-PW7-50

Accommodates seven 50mm round, unmounted filters Designed for large-format and full-frame sensors Enables automated LRGB and narrowband imaging se...

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$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
Player One SII 7nm Narrowband Filter S-series – 2"
Player One SII 7nm Narrowband Filter S-series – 1.25"
$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00

Player One SII 7nm Narrowband Filter S-series

Options available

Sulfur-II (SII) Narrowband Filter 7nm Narrowband Passband Available in 1.25" and 2" Mounted Formats Optimized for High-Contrast Astrophotography A...

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$129.00 - $249.00
$129.00 - $249.00
$129.00 - $249.00
$129.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

Player One UV/IR-Cut Anti-Halo Filter - 2"

POA-AH-UV-IR-CUT-2
2 in stock

Blocks unwanted Ultraviolet (UV) and Infrared (IR) wavelengths Features advanced anti-halo coatings to minimize reflections Standard 2" filter cel...

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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

Player One UV/IR-Cut S-Series Filter - 1.25"

POA-UV-IR-CUT-125
3 in stock

Corrects Color Balance for Color Cameras Blocks Unwanted Ultraviolet (UV) and Infrared (IR) Light Enhances Contrast for Lunar and Solar Imaging Hi...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00

Player One UVenus UV-Pass Filter E-series - 1.25"

POA-UV125E

Reveals Cloud Detail on Venus UV-Pass Band Optimized for Planetary Imaging E-Series High-Quality Optical Glass Substrate 1.25" Mounted Filter Form...

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$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00

QHYCCD 1200-1800nm SWIR Filter

QHY-040028

1200-1800nm SWIR Bandpass Designed for QHYCCD InGaAs Cameras Compatible with QHY990 Series Description FAQ Specifications In the Box Warranty ...

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$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
$30.00 - $30.00
$30.00
$30.00 - $30.00
$30.00

QHYCCD CFW 1.25" Adapter

QHY-020113
1 in stock

Connects QHY monochrome planetary cameras to QHYCFW3S filter wheels Enables the use of standard 1.25-inch mounted filters Compatible with 31mm unm...

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$30.00 - $30.00
$30.00
$30.00 - $30.00
$30.00
$279.00 - $1,199.00
$279.00 - $1,199.00
$279.00 - $1,199.00
$279.00

QHYCCD CFW3

Options available
2 variants in stock

Multiple carousel options for 1.25", 36mm, 2", and 50mm filters Direct-drive motor with shortest-path seeking logic Thin body profile enables use ...

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$279.00 - $1,199.00
$279.00 - $1,199.00
$279.00 - $1,199.00
$279.00
$1,419.00 - $1,419.00
$1,419.00
$1,419.00 - $1,419.00
$1,419.00

SBIG Aluma 8 x 36mm Filter Wheel

DL-FW8S-Aluma

FW8S-Aluma is the standard (non-guided) 8-position filter wheel for Aluma Series cameras. This filter wheel does not have abuilt-in self-guiding im...

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$1,419.00 - $1,419.00
$1,419.00
$1,419.00 - $1,419.00
$1,419.00
$359.00 - $359.00
$359.00
$359.00 - $359.00
$359.00

SBIG CFW-402 RGBC for STF-402

DL-CFW-402-RGB

This is the internal filter wheel for the SBIG STF-402M only. It contains very high quality interference filters custom made for this camera. Note ...

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$359.00 - $359.00
$359.00
$359.00 - $359.00
$359.00

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.