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Light Pollution Filters

Light pollution filters have become a more complicated recommendation than they were twenty years ago. Against the old sodium and mercury street lighting they worked remarkably well; against broad-spectrum LED there is no narrow band left to reject. David Astro carries light pollution filters in Canada from Canadian stock, and we will tell you plainly what one will and will not do at your site.

The honest summary is that these filters help substantially on emission nebulae and very little on galaxies and star clusters. Tell us your targets and local lighting and we will give you a realistic expectation.

Filters

CA$281.00 - CA$281.00
CA$281.00
CA$281.00 - CA$281.00
CA$281.00

Antlia Quad Band Light Pollution Filter - 2"

ANT-QUAD-2
5 in stock

The Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky...

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CA$281.00 - CA$281.00
CA$281.00
CA$281.00 - CA$281.00
CA$281.00
CA$130.00 - CA$209.00
CA$130.00 - CA$209.00
CA$130.00 - CA$209.00
CA$130.00

Baader Contrast-Booster Filter

Options available
2 variants in stock

Enhances contrast for lunar and planetary observing Significantly darkens skyglow background Reveals subtle details in Jupiter's cloud belts and M...

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CA$130.00 - CA$209.00
CA$130.00 - CA$209.00
CA$130.00 - CA$209.00
CA$130.00
CA$130.00 - CA$213.00
CA$130.00 - CA$213.00
CA$130.00 - CA$213.00
CA$130.00

Baader Moon & Skyglow Filter

Options available

Enhances lunar and planetary contrast with a Neodymium glass substrate Suppresses skyglow from artificial lighting without aggressive color shifti...

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CA$130.00 - CA$213.00
CA$130.00 - CA$213.00
CA$130.00 - CA$213.00
CA$130.00
Baader Planetarium Baader UHC-L / Ultra-L-Booster Filter 65x65mm
CA$561.00 - CA$561.00
CA$561.00
CA$561.00 - CA$561.00
CA$561.00

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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CA$561.00 - CA$561.00
CA$561.00
CA$561.00 - CA$561.00
CA$561.00
CA$143.00 - CA$401.00
CA$143.00 - CA$401.00
CA$143.00 - CA$401.00
CA$143.00

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

Options available
4 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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CA$143.00 - CA$401.00
CA$143.00 - CA$401.00
CA$143.00 - CA$401.00
CA$143.00
CA$153.00 - CA$265.00
CA$153.00 - CA$265.00
CA$153.00 - CA$265.00
CA$153.00

Baader Visual OIII Nebula Filter

Options available

Delivers the absolute highest contrast views of many diffuse and planetary nebula. For many objects, the Baader O-III reveals a level of intricate ...

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CA$153.00 - CA$265.00
CA$153.00 - CA$265.00
CA$153.00 - CA$265.00
CA$153.00
CA$132.00 - CA$132.00
CA$132.00
CA$132.00 - CA$132.00
CA$132.00

Celestron Oxygen III Narrowband Filter - 1.25 in

CEL-93623

Isolates doubly-ionized oxygen lines (496nm and 501nm) Provides extreme contrast for planetary and emission nebulae Blocks the entire visual spect...

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CA$132.00 - CA$132.00
CA$132.00
CA$132.00 - CA$132.00
CA$132.00
CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00

Celestron Oxygen III Narrowband Filter - 2 in

CEL-93624

Isolates the 496nm and 501nm Oxygen III wavelengths Blocks the entire visual spectrum from 400nm to 700nm Ultra-hard, vacuum-deposited coatings pr...

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CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00
CA$132.00 - CA$132.00
CA$132.00
CA$132.00 - CA$132.00
CA$132.00

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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CA$132.00 - CA$132.00
CA$132.00
CA$132.00 - CA$132.00
CA$132.00
CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00

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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CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00
CA$385.00 - CA$770.00
CA$385.00 - CA$770.00
CA$385.00 - CA$770.00
CA$385.00

Chroma LoGlow Filter

Options available

Blocks common spectral lines from lighting sources. This filter provides balanced color for the visible spectrum while blocking most emission from ...

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CA$385.00 - CA$770.00
CA$385.00 - CA$770.00
CA$385.00 - CA$770.00
CA$385.00
Explore Scientific Dark-Sky Filter 77mm Slim
CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00

Explore Scientific Dark-Sky Filter 77mm Slim

ES-310260

77mm Standard Filter Thread Slim Profile Prevents Vignetting Optimized for Wide-Angle Lenses Suppresses Sodium Vapor Streetlight Glow Enhances Con...

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CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00
CA$153.99 - CA$168.00
CA$153.99 - CA$168.00
CA$153.99 - CA$168.00
CA$153.99

Explore Scientific Nebula Filter CLS - 1.25"

Options available

City Light Suppression (CLS) Filter Enhances Contrast for Deep-Sky Objects Available in 1.25" and 2" Sizes Ideal for Viewing Nebulae and Galaxies ...

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CA$153.99 - CA$168.00
CA$153.99 - CA$168.00
CA$153.99 - CA$168.00
CA$153.99
CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99

Explore Scientific Nebula Filter H-Beta - 2.0"

ES-310230

2.0-inch Barrel Size Isolates Hydrogen-Beta (H-Beta) Emission Line Dramatically Increases Contrast on Specific Nebulae Blocks Artificial Light Pol...

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CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99
Optolong Clear Sky Light Pollution Filter
CA$139.00 - CA$287.00
CA$139.00 - CA$287.00
CA$139.00 - CA$287.00
CA$139.00

Optolong Clear Sky Light Pollution Filter

Options available

Suppresses common sources of urban light pollution Enhances contrast for deep-sky objects Improves natural color balance in astrophotography Durab...

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CA$139.00 - CA$287.00
CA$139.00 - CA$287.00
CA$139.00 - CA$287.00
CA$139.00
Optolong CLS Light Pollution Filter
CA$77.00 - CA$119.00
CA$77.00 - CA$119.00
CA$77.00 - CA$119.00
CA$77.00

Optolong CLS Light Pollution Filter

Options available

Suppresses common light pollution sources Average transmission greater than 90% on key nebula emission lines Blocks light pollution lines with >...

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CA$77.00 - CA$119.00
CA$77.00 - CA$119.00
CA$77.00 - CA$119.00
CA$77.00
Optolong CLS-CCD Light Pollution Filter
CA$133.00 - CA$223.00
CA$133.00 - CA$223.00
CA$133.00 - CA$223.00
CA$133.00

Optolong CLS-CCD Light Pollution Filter

Options available

Blocks >99% of primary light pollution emission lines Achieves >90% average transmission on key nebula wavelengths Integrated 300-1100nm UV/...

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CA$133.00 - CA$223.00
CA$133.00 - CA$223.00
CA$133.00 - CA$223.00
CA$133.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

Optolong L-Pro + UHC Clip Filter Kit

Options available

Two Optolong Clip-in Light Pollution Filters in One Kit L-Pro: Multi-Bandpass Suppression Across 380-750nm UHC: >99% Blocking of Mercury and So...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$199.00 - CA$377.00
CA$199.00 - CA$377.00
CA$199.00 - CA$377.00
CA$199.00

Optolong L-Pro Filter

Options available
13 variants in stock

Multi-Bandpass Light Pollution Suppression Effective Spectrum from 380-750nm Maintains Natural Color Balance on Broadband Targets High Transmissio...

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CA$199.00 - CA$377.00
CA$199.00 - CA$377.00
CA$199.00 - CA$377.00
CA$199.00
CA$558.00 - CA$558.00
CA$558.00
CA$558.00 - CA$558.00
CA$558.00

Optolong L-Quad Enhance + L-Para L1 Dual-Combo Filter Set - 2"

OPT-L1-SET
4 in stock

L-Quad Enhance Filter: A quad-bandpass filter designed for balanced RGB color from broadband targets. L-Para L1 Filter: A dual-narrowband filter...

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CA$558.00 - CA$558.00
CA$558.00
CA$558.00 - CA$558.00
CA$558.00
CA$77.00 - CA$161.00
CA$77.00 - CA$161.00
CA$77.00 - CA$161.00
CA$77.00

Optolong UHC Filter

Options available
9 variants in stock

Reduces skyglow from artificial and natural light pollution Blocks >99% of mercury vapor and sodium vapor light Passes key nebula emission line...

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CA$77.00 - CA$161.00
CA$77.00 - CA$161.00
CA$77.00 - CA$161.00
CA$77.00
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 UHC Light Pollution Filter
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00

SVBONY UHC Ultra High Contrast Light Pollution Filter

Options available

Reduces light pollution from artificial lighting Enhances contrast for emission nebulae Available in 1.25", 2", and Canon EOS-C formats Durable al...

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CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00 - CA$70.00
CA$34.00
CA$328.00 - CA$328.00
CA$328.00
CA$328.00 - CA$328.00
CA$328.00

William Optics STC Ultra Layer Astro Multispectra Filter - 48mm

WO-YF-STC-M48

48mm (M48) Filter Size Multi-Bandpass Light Pollution Suppression Passes H-α, H-β, and OIII Emission Lines Schott B270 Optical Glass Substrate STC...

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CA$328.00 - CA$328.00
CA$328.00
CA$328.00 - CA$328.00
CA$328.00

What Light Pollution Filters Can and Cannot Do

A filter removes wavelengths. It works when the unwanted light occupies a different part of the spectrum from the light you want, and fails when they overlap.

  • Broadband city light filters: Reject mercury and sodium emission lines while passing most of the visible spectrum. Effective under older street lighting, much less so under LED.
  • UHC-type filters: Pass a narrower band containing the main nebula emission lines. Strong contrast gain on emission nebulae regardless of the lighting type causing the skyglow.
  • OIII filters: Very narrow, dramatic on planetary nebulae and supernova remnants, and dim enough to want substantial aperture behind them.
  • Dual-band imaging filters: Pass Ha and OIII together for one-shot colour cameras, which is the most effective light pollution strategy currently available for imagers.
  • What they do not help: Galaxies, star clusters and reflection nebulae emit across the spectrum. A narrow filter removes their light along with the skyglow.
  • LED lighting reality: Broad-spectrum white LED leaves no gap to filter, which is why narrowband and dual-band approaches have largely replaced broadband filters for imaging.

Why Choose David Astro for Light Pollution Filters

We would rather tell you a filter will not help than sell you one that disappoints.

  • Honest about LED: If your local lighting has converted to LED, we will say that a broadband filter will do little and point you toward narrowband or dual-band instead.
  • Target-based advice: Galaxies and clusters do not benefit. We will tell you that before you buy rather than let you discover it under the sky.
  • Aperture matched: Narrower filters need more aperture to remain useful visually, and we size the recommendation to your telescope.
  • Authorized dealer: Genuine filters with verified coatings and manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees for Canadian buyers.

Light Pollution Filters in Canada — Frequently Asked Questions

Will a light pollution filter help under LED streetlights?
A broadband one, very little — LED emits across the visible spectrum with no narrow band to reject. A UHC or narrowband filter still works well on emission nebulae because it passes only specific emission lines.
Do these filters help with galaxies?
Essentially no. Galaxy light is broadband, so a filter removes it in the same proportion as the skyglow. Darker skies are the only real answer for galaxies.
Which filter for visual use in a city?
A UHC-type filter gives the best contrast gain across the widest range of emission targets, and is a better first purchase than a narrower OIII for most apertures.
What about imaging from a bright site?
Use dual-band or narrowband filters rather than broadband light pollution filters. They isolate the emission lines and reject nearly everything else, which is far more effective.

Imaging under city skies?

Tell us your targets and your local lighting and we will recommend honestly. In Canadian stock, shipped worldwide.