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Imaging Filters

Not every imaging filter is narrowband or LRGB. Ultraviolet and infrared cut filters, luminance filters, methane band filters for planetary work and dedicated infrared pass filters each solve a specific problem, and several of them are more useful than their obscurity suggests. David Astro carries imaging filters in Canada, in Canadian inventory and shipped domestically.

These filters address particular situations rather than general imaging. Tell us what problem you are seeing and we will say whether one of them fixes it.

Filters

Baader Planetarium O-III 1.25" Super-G Filter (9nm) - CMOS optimiert
$108.00 - $200.00
$108.00 - $200.00
$108.00 - $200.00
$108.00

Baader Planetarium O-III Super-G Filter (9nm) – CMOS-optimized

Options available
2 variants in stock

9nm O-III Narrowband Passband Functions as a "Super-G" Green Filter Replacement CMOS-Optimized Coatings for High Contrast Reduces Impact of Atmosp...

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$108.00 - $200.00
$108.00 - $200.00
$108.00 - $200.00
$108.00
Baader Planetarium RGB B-Filter 1.25" – CMOS-optimized
$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00

Baader Planetarium RGB B-Filter – CMOS-optimized

Options available

Available in 1.25" & 2" Mounted, Round Unmounted and Square Sizes Blue (B) Channel for LRGB Imaging Optimized for Modern CMOS Sensors Designed...

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$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00
Baader Planetarium RGB Filter Set 1.25" – CMOS-optimized
$333.00 - $907.00
$333.00 - $907.00
$333.00 - $907.00
$333.00

Baader Planetarium RGB Filter Set – CMOS-optimized

Options available

Set of three Red, Green, and Blue (RGB) filters Optimized for modern CMOS sensors to eliminate reflections Available in 1.25" & 2" mounted, 31...

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$333.00 - $907.00
$333.00 - $907.00
$333.00 - $907.00
$333.00
Baader Planetarium RGB G-Filter 1.25" – CMOS-optimized
$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00

Baader Planetarium RGB G-Filter – CMOS-optimized

Options available

Green (G) Component for LRGB Color Imaging Available in 1.25" & 2" Mounted, Round Unmounted and Square Sizes Optimized for Modern CMOS Sensors...

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$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00
Baader Planetarium RGB R-Filter 1.25" – CMOS-optimized
$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00

Baader Planetarium RGB R-Filter – CMOS-optimized

Options available

Red (R) filter for LRGB astrophotography Available in 1.25" & 2" mounted, round unmounted and square sizes Optimized for modern CMOS sensors H...

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$123.00 - $360.00
$123.00 - $360.00
$123.00 - $360.00
$123.00
Baader Planetarium Baader S-II 1.25" f/2 Highspeed-Filter (6.5nm) – CMOS-optimized
$195.00 - $475.00
$195.00 - $475.00
$195.00 - $475.00
$195.00

Baader Planetarium S-II f/2 Highspeed-Filter (6.5nm) – CMOS-optimized

Options available

6.5nm Sulfur-II Narrowband Filter Optimized for f/2 High-Speed Optical Systems Available in 1.25" & 2" Mounted, 31mm, 36mm, 50.4mm & 2" FC...

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$195.00 - $475.00
$195.00 - $475.00
$195.00 - $475.00
$195.00
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 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
$106.00 - $190.00
$106.00 - $190.00
$106.00 - $190.00
$106.00

Baader Semi-APO Filter

Options available

Reduces chromatic aberration in achromatic refractors Enhances contrast on the Moon, planets, and bright stars Improves star sharpness by tighteni...

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$106.00 - $190.00
$106.00 - $190.00
$106.00 - $190.00
$106.00
$119.00 - $320.00
$119.00 - $320.00
$119.00 - $320.00
$119.00

Baader UHC-S/L-Booster Filter - CMOS-Optimized

Options available
6 variants in stock

Targets modern LED and broadband light pollution Optimized blue transmission to reject artificial skyglow Serves as a "pre-filter" for finding obj...

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$119.00 - $320.00
$119.00 - $320.00
$119.00 - $320.00
$119.00
$87.00 - $143.00
$87.00 - $143.00
$87.00 - $143.00
$87.00

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

Options available
4 variants in stock

Blocks unwanted UV and IR wavelengths for sharper stars Optimized for modern CMOS sensors to prevent star bloat Serves as a high-transmission Lumi...

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$87.00 - $143.00
$87.00 - $143.00
$87.00 - $143.00
$87.00
$94.95 - $94.95
$94.95
$94.95 - $94.95
$94.95

Celestron UHC/LPR Filter - 1.25"

CEL-94123

Selectively blocks mercury vapor, sodium vapor, and natural sky glow Achieves over 97% transmission of critical nebula emission lines Features a m...

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$94.95 - $94.95
$94.95
$94.95 - $94.95
$94.95
$124.95 - $124.95
$124.95
$124.95 - $124.95
$124.95

Celestron UHC/LPR Filter - 2"

CEL-94124

Selectively blocks light pollution from mercury and sodium vapor lights Achieves over 97% light transmission for maximum brightness 60nm bandpass ...

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$124.95 - $124.95
$124.95
$124.95 - $124.95
$124.95
$275.00 - $725.00
$275.00 - $725.00
$275.00 - $725.00
$275.00

Chroma B-Bessel Filter

Options available

Blue photometric filter in UVBRI series Filters designed for use with CCD and for f/4.0 or slower No reflections leading to image distortions or ""...

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$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 Blue Filter

Options available

Blue filter for color rendering with RGB set Filters designed for use with CCD and for f/4.0 or slower No reflections leading to image distortions ...

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$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00
$130.00 - $375.00
$130.00 - $375.00
$130.00 - $375.00
$130.00

Chroma Clear Filter

Options available

Filters designed for use with CCD and for f/4.0 or slower No reflections leading to image distortions or "back reflections" Transmitted wavefront ...

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$130.00 - $375.00
$130.00 - $375.00
$130.00 - $375.00
$130.00
$150.00 - $500.00
$150.00 - $500.00
$150.00 - $500.00
$150.00

Chroma Green Filter

Options available

Green filter for color rendering with RGB set Filters designed for use with CCD and for f/4.0 or slower No reflections leading to image distortions...

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$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 H-alpha Filter - 3nm

Options available

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter i...

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$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 H-alpha Filter - 5nm

Options available

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter i...

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$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 H-alpha Filter - 8nm

Options available

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter i...

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$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 H-alpha Filter Optimized for f/3 - 3nm

Options available

H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter i...

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$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00 - $1,550.00
$575.00

Specialist Imaging Filters

Each of these targets a specific defect or a specific wavelength range that general-purpose filters do not address.

  • UV and IR cut filters: Essential with refractors, which do not focus infrared at the same point as visible light. Without one, stars are bloated and soft in a way that looks like poor optics.
  • Luminance filters: A broad visible-range filter with UV and IR blocking, used as the detail-carrying channel in LRGB imaging.
  • Infrared pass filters: Pass only infrared, which cuts through atmospheric turbulence better than visible light and can sharpen planetary detail in poor seeing.
  • Methane band filters: Very narrow filters at 889 nm revealing atmospheric structure on Jupiter, Saturn and the ice giants that is invisible in visible light.
  • Continuum filters: Narrow green-band filters used for lunar and planetary imaging, reducing the effect of atmospheric dispersion.
  • Anti-halation and reflection considerations: Coating quality matters here too, since a filter close to the sensor can produce reflection artifacts around bright objects.

Why Choose David Astro for Imaging Filters

These are problem-specific purchases, and the first question is whether you have the problem.

  • Diagnosis before recommendation: Send us a sample image and we will tell you whether bloated stars are an infrared problem, a spacing problem or a focus problem.
  • Refractor advice: If you image with a doublet and have no UV/IR cut filter, that is very often the cause of soft bright stars, and it is the cheapest fix in imaging.
  • Seeing-based advice: We will explain when an infrared pass filter genuinely helps planetary work and when it simply costs you resolution.
  • Authorized dealer: Genuine filters with verified coatings and manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees for Canadian buyers.

Imaging Filters in Canada — Frequently Asked Questions

Do I need a UV/IR cut filter?
With any refractor, yes. ED doublets and even triplets do not bring infrared to the same focus as visible light, and an unfiltered sensor records that as bloated, soft stars.
Does an infrared filter help with bad seeing?
For planetary imaging, often yes. Longer wavelengths are less affected by atmospheric turbulence, so an IR pass filter can produce sharper results on a poor night, at the cost of some resolution.
What is a methane band filter for?
It isolates a methane absorption band at 889 nm, revealing cloud structure on the gas giants that is invisible in visible light. It is a specialist filter needing substantial aperture and long exposures.
Why are my bright stars bloated?
Most commonly unblocked infrared in a refractor, sometimes filter reflections, sometimes back-focus error. Send us a crop and we will tell you which.

Diagnosing an imaging problem?

Send us a sample crop and we will tell you what will actually fix it. Held in Canada, shipped fast.