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EXPLORE THE AUGUST 2025 ASTRONOMY CALENDAR NOW!
EXPLORE THE AUGUST 2025 ASTRONOMY CALENDAR!

Optical Filters

Enhance your celestial and terrestrial observations with Explore Scientific’s range of optical filters. Designed to improve contrast, reduce glare, and bring out subtle details, these filters are essential tools for both visual astronomers and astrophotographers. From light pollution reduction to specialized color filters, our collection helps you see and capture the night sky like never before.

Filters

  • Sun Catcher Variable Large Aperture Solar Filter

    Explore Scientific
    $ 20.59 - $ 51.49
    $ 20.59 - $ 51.49
    $ 20.59 - $ 51.49
    $ 20.59

    If you need a Sun Catcher Solar Filter for 10-inch and 12-inch Dobsonian telescopes, purchase SC14-00. Cassiopeia Observatory Review - Click Here...

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    $ 20.59 - $ 51.49
    $ 20.59 - $ 51.49
    $ 20.59 - $ 51.49
    $ 20.59
  • Neutral Density Filter 2" ND 0.9

    Neutral Density Filter 2" ND 0.9

    Explore Scientific
    $ 61.79 - $ 61.79
    $ 61.79
    $ 61.79 - $ 61.79
    $ 61.79

    The neutral density filter transmits light uniformly across the entire visual spectrum. It serves as an excellent filter to reduce glare and irradi...

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    $ 61.79 - $ 61.79
    $ 61.79
    $ 61.79 - $ 61.79
    $ 61.79
  • Nebula Filter CLS 2.0-inch

    Nebula Filter CLS 2.0-inch

    Explore Scientific
    $ 123.59 - $ 123.59
    $ 123.59
    $ 123.59 - $ 123.59
    $ 123.59

    Explore Scientific Nebula Filter 1.25" CLS Range from 436nm to 536nm with peak at 488nm. Transmission 98.3% This is a general-purpose light-pollut...

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    $ 123.59 - $ 123.59
    $ 123.59
    $ 123.59 - $ 123.59
    $ 123.59
  • Nebula Filter UHC 1.25-inch

    Nebula Filter UHC 1.25-inch

    Explore Scientific
    $ 113.29 - $ 113.29
    $ 113.29
    $ 113.29 - $ 113.29
    $ 113.29

    Explore Scientific Nebula Filter 1.25" UHC Range from 458nm to 508nm with peak at 488nm. Transmission 96.7% UHC - This is an ultra-high contrast na...

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    $ 113.29 - $ 113.29
    $ 113.29
    $ 113.29 - $ 113.29
    $ 113.29
  • Nebula Filter H-Beta 1.25-inch

    Nebula Filter H-Beta 1.25-inch

    Explore Scientific
    $ 133.89 - $ 133.89
    $ 133.89
    $ 133.89 - $ 133.89
    $ 133.89

    Explore Scientific Nebula Filter 1.25" H-Beta Range from 478nm to 496nm with peak at 489nm. Transmission 94.5% H-Beta - Hydrogen is the most abunda...

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    $ 133.89 - $ 133.89
    $ 133.89
    $ 133.89 - $ 133.89
    $ 133.89
  • Neutral Density Filter 1.25" ND 0.9

    Neutral Density Filter 1.25" ND 0.9

    Explore Scientific
    $ 51.49 - $ 51.49
    $ 51.49
    $ 51.49 - $ 51.49
    $ 51.49

    The neutral density filter transmits light uniformly across the entire visual spectrum. It serves as an excellent filter to reduce glare and irradi...

    View full details
    $ 51.49 - $ 51.49
    $ 51.49
    $ 51.49 - $ 51.49
    $ 51.49
  • Nebula Filter H-Beta 2.0-inch

    Nebula Filter H-Beta 2.0-inch

    Explore Scientific
    $ 185.39 - $ 185.39
    $ 185.39
    $ 185.39 - $ 185.39
    $ 185.39

    Explore Scientific Nebula Filter 1.25" H-Beta Range from 478nm to 496nm with peak at 489nm. Transmission 94.5% H-Beta - Hydrogen is the most abunda...

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    $ 185.39 - $ 185.39
    $ 185.39
    $ 185.39 - $ 185.39
    $ 185.39
  • Nebula Filter CLS 1.25-inch

    Nebula Filter CLS 1.25-inch

    Explore Scientific
    $ 113.29 - $ 113.29
    $ 113.29
    $ 113.29 - $ 113.29
    $ 113.29

    Explore Scientific Nebula Filter 1.25" CLS Range from 436nm to 536nm with peak at 488nm. Transmission 98.3% This is a general-purpose light-polluti...

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    $ 113.29 - $ 113.29
    $ 113.29
    $ 113.29 - $ 113.29
    $ 113.29
  • Explore Scientific 2" Variable Polarizing Filter

    Explore Scientific 2" Variable Polarizing Filter

    Explore Scientific
    $ 175.09 - $ 175.09
    $ 175.09
    $ 175.09 - $ 175.09
    $ 175.09

    Features Variable polarizing filter Individually adjustable image brightness Made from highly parallel optical glass Black anodized aluminum hous...

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    $ 175.09 - $ 175.09
    $ 175.09
    $ 175.09 - $ 175.09
    $ 175.09
  • OPTOLONG 2" L-eXtreme Deep-Sky Light Pollution Filter

    OPTOLONG 2" L-eXtreme Deep-Sky Light Pollution Filter

    Optolong
    $ 318.27 - $ 318.27
    $ 318.27
    $ 318.27 - $ 318.27
    $ 318.27

    The L-eXtreme is a two-band filter and the ideal choice for strong suppression of light pollution. It enables astrophotos of objects with narrow-ba...

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    $ 318.27 - $ 318.27
    $ 318.27
    $ 318.27 - $ 318.27
    $ 318.27
  • Explore Scientific Dark-Sky Filter 77mm Slim

    Explore Scientific Dark-Sky Filter 77mm Slim

    Explore Scientific
    $ 154.49 - $ 154.49
    $ 154.49
    $ 154.49 - $ 154.49
    $ 154.49

    Features Dark-Sky filter Contrast increase in aurora & deep-sky photography Reduction of stray light from street lights, for example Wide-ang...

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    $ 154.49 - $ 154.49
    $ 154.49
    $ 154.49 - $ 154.49
    $ 154.49
  • Nebula Filter Oxygen III 1.25-inch 6.5nm

    Nebula Filter Oxygen III 1.25-inch 6.5nm

    Explore Scientific
    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76

    Features High quality Explore Scientific O-III filter Let only the oxygen emission lines "through" Absorbs all other emission lines Absorbs almo...

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    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76
  • Nebula Filter S-II 1.25-inch 12nm

    Nebula Filter S-II 1.25-inch 12nm

    Explore Scientific
    $ 154.49 - $ 154.49
    $ 154.49
    $ 154.49 - $ 154.49
    $ 154.49

    Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

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    $ 154.49 - $ 154.49
    $ 154.49
    $ 154.49 - $ 154.49
    $ 154.49
  • Nebula Filter S-II 1.25-inch 6.5nm

    Nebula Filter S-II 1.25-inch 6.5nm

    Explore Scientific
    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76

    Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

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    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76
  • Nebula Filter H-Alpha 1.25-inch 12nm

    Nebula Filter H-Alpha 1.25-inch 12nm

    Explore Scientific
    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76

    Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

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    $ 163.76 - $ 163.76
    $ 163.76
    $ 163.76 - $ 163.76
    $ 163.76
  • Nebula Filter H-Alpha 1.25-inch 7nm

    Nebula Filter H-Alpha 1.25-inch 7nm

    Explore Scientific
    $ 180.24 - $ 180.24
    $ 180.24
    $ 180.24 - $ 180.24
    $ 180.24

    Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

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    $ 180.24 - $ 180.24
    $ 180.24
    $ 180.24 - $ 180.24
    $ 180.24
  • Nebula Filter Oxygen III 2-inch 6.5nm

    Nebula Filter Oxygen III 2-inch 6.5nm

    Explore Scientific
    $ 257.49 - $ 257.49
    $ 257.49
    $ 257.49 - $ 257.49
    $ 257.49

    Features High quality Explore Scientific O-III filter Let only the oxygen emission lines "through" Absorbs all other emission lines Absorbs almo...

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    $ 257.49 - $ 257.49
    $ 257.49
    $ 257.49 - $ 257.49
    $ 257.49
  • Nebula Filter S-II 2-inch 12nm

    Nebula Filter S-II 2-inch 12nm

    Explore Scientific
    $ 216.29 - $ 216.29
    $ 216.29
    $ 216.29 - $ 216.29
    $ 216.29

    Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

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    $ 216.29 - $ 216.29
    $ 216.29
    $ 216.29 - $ 216.29
    $ 216.29
  • Nebula Filter S-II 2-inch 6.5nm

    Nebula Filter S-II 2-inch 6.5nm

    Explore Scientific
    $ 257.49 - $ 257.49
    $ 257.49
    $ 257.49 - $ 257.49
    $ 257.49

    Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

    View full details
    $ 257.49 - $ 257.49
    $ 257.49
    $ 257.49 - $ 257.49
    $ 257.49
  • Nebula Filter H-Alpha 2-inch 12nm

    Nebula Filter H-Alpha 2-inch 12nm

    Explore Scientific
    $ 204.96 - $ 204.96
    $ 204.96
    $ 204.96 - $ 204.96
    $ 204.96

    Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

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    $ 204.96 - $ 204.96
    $ 204.96
    $ 204.96 - $ 204.96
    $ 204.96
  • Nebula Filter H-Alpha 2-inch 7nm

    Nebula Filter H-Alpha 2-inch 7nm

    Explore Scientific
    $ 266.76 - $ 266.76
    $ 266.76
    $ 266.76 - $ 266.76
    $ 266.76

    Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

    View full details
    $ 266.76 - $ 266.76
    $ 266.76
    $ 266.76 - $ 266.76
    $ 266.76
  • Bresser Single Polarizing Filter 1.25"

    Bresser Single Polarizing Filter 1.25"

    Bresser
    $ 51.49 - $ 51.49
    $ 51.49
    $ 51.49 - $ 51.49
    $ 51.49

    Features 1.25 "linear polarization filter Socket with 1.25 "filter thread Also suitable for Lunt Herschel wedges Description Simple linear 1.25...

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    $ 51.49 - $ 51.49
    $ 51.49
    $ 51.49 - $ 51.49
    $ 51.49

  • Solar Filter/Sun Shade for Galileoscope Refractor Telescope STEM Kit

    Explore Scientific
    $ 4.07 - $ 4.07
    $ 4.07
    $ 4.07 - $ 4.07
    $ 4.07

    Galileoscope Refractor Telescope STEM Kit - Click Here Features Lightweight Includes a sun shade Stronger than any other solar filter film on the...

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    $ 4.07 - $ 4.07
    $ 4.07
    $ 4.07 - $ 4.07
    $ 4.07
  • AstroZap - Baader Solar Filters

    AstroZap - Baader Solar Filters

    Explore Scientific
    $ 72.92 - $ 185.40
    $ 72.92 - $ 185.40
    $ 72.92 - $ 185.40
    $ 72.92

    Features With AstroSolar™ the Sun appears in neutral white. Baader AstroSolar™ film Filter cell constructed from lightweight 18Ga. aluminum and p...

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    $ 72.92 - $ 185.40
    $ 72.92 - $ 185.40
    $ 72.92 - $ 185.40
    $ 72.92
  • OPTOLONG 1.25" L-eNhance Deep-Sky Light Pollution Filter

    OPTOLONG 1.25" L-eNhance Deep-Sky Light Pollution Filter

    Optolong
    $ 184.37 - $ 184.37
    $ 184.37
    $ 184.37 - $ 184.37
    $ 184.37

    The L-eNhance is a three-band filter and ideal for strong suppression of light pollution. It enables astrophotos of objects with narrow-band emissi...

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    $ 184.37 - $ 184.37
    $ 184.37
    $ 184.37 - $ 184.37
    $ 184.37
  • OPTOLONG 1.25" L-eXtreme Deep-Sky Light Pollution Filter

    OPTOLONG 1.25" L-eXtreme Deep-Sky Light Pollution Filter

    Optolong
    $ 246.17 - $ 246.17
    $ 246.17
    $ 246.17 - $ 246.17
    $ 246.17

    The L-eXtreme is a two-band filter and the ideal choice for strong suppression of light pollution. It enables astrophotos of objects with narrow-ba...

    View full details
    $ 246.17 - $ 246.17
    $ 246.17
    $ 246.17 - $ 246.17
    $ 246.17
  • OPTOLONG 2" L-eNhance Deep-Sky Light Pollution Filter

    OPTOLONG 2" L-eNhance Deep-Sky Light Pollution Filter

    Optolong
    $ 235.87 - $ 235.87
    $ 235.87
    $ 235.87 - $ 235.87
    $ 235.87

    The L-eNhance is a three-band filter and ideal for strong suppression of light pollution. It enables astrophotos of objects with narrow-band emissi...

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    $ 235.87 - $ 235.87
    $ 235.87
    $ 235.87 - $ 235.87
    $ 235.87
  • OPTOLONG 2" L-Pro Deep-Sky Light Pollution Filter

    OPTOLONG 2" L-Pro Deep-Sky Light Pollution Filter

    Optolong
    $ 204.97 - $ 204.97
    $ 204.97
    $ 204.97 - $ 204.97
    $ 204.97

    The L-Pro broadband filter is the ideal choice for suppressing light pollution from artificial light and enables astrophotos of broadband emission ...

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    $ 204.97 - $ 204.97
    $ 204.97
    $ 204.97 - $ 204.97
    $ 204.97
  • Explore Scientific 1.25" Variable Polarizing Filter

    Explore Scientific 1.25" Variable Polarizing Filter

    Explore Scientific
    $ 60.76 - $ 60.76
    $ 60.76
    $ 60.76 - $ 60.76
    $ 60.76

    Features Variable polarizing filter Individually adjustable image brightness Made from highly parallel optical glass Black anodized aluminum hous...

    View full details
    $ 60.76 - $ 60.76
    $ 60.76
    $ 60.76 - $ 60.76
    $ 60.76
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