• 7nm Narrow Bandpass: Isolates the 672 nm Sulfur-II (SII) wavelength with up to 90% light transmission.
• Hubble Palette Essential: Crucial component for SHO false-color astrophotography (Pillars of Creation style).
• Light Pollution & Moonlight Rejection: Blocks unwanted artificial lights and natural skyglow for high-contrast imaging.
• Standard 31.75 mm (1.25 in) Mount: Fits standard filter wheels and focal reducers with M28.5 x 0.6 mm threads.
• Advanced Anti-Reflection Coating: Reduces halos and star reflections thanks to updated glass substrates.

• 7nm Narrow Bandpass: Isolates the 656 nm H-Alpha wavelength with up to 90% light transmission.
• High Contrast Imaging: Cuts through severe light pollution and moonlight to reveal intricate nebula details.
• Standard 31.75 mm (1.25 in) Mount: Fits standard filter wheels and focal reducers with standard M28.5 x 0.6 mm threads.
• Advanced Anti-Reflection Optical Coating: Minimizes reflections and reduces halos around bright stars.

• 7nm Narrow Bandpass: Isolates the critical 500 nm Oxygen-III (OIII) emission line with up to 90% light transmission.
• Essential for HOO & SHO Imaging: Crucial channel for bicolor (HOO) and Hubble Palette (SHO) deep-sky astrophotography.
• Maximum Light Pollution Rejection: Blocks artificial mercury and sodium lighting as well as natural atmospheric skyglow.
• Standard 31.75 mm (1.25 in) Mount: Fits standard filter wheels and drawers with M28.5 x 0.6 mm threads.
• Updated Coating Standard: Offers higher off-band rejection (<0.1% OD3) and reduces star halos.

• Cut-off depth ≥OD4; highly efficient in blocking urban light pollution or other background light; use this multi-bandpass filter for astrophotography in urban without traveling long distances to the suburbs;
• Compatible with 99% astrophotography systems; if you have different astrophotography systems, no need to prepare dedicated filters, one SV240 can meet your needs due to its high compatibility;
• Photoing more kinds of targets; SV240 multi-narrowband filter select Ha,OIII,H-Beta wavelength effectively can cover almost photoing needs;
• High transmittance; the >90% transmittance in core wavelength of Ha,OIII, H-Beta, more objects for your astrophotography by using this multi-bandpass filter;
• Multi-bandpass filters; without multiple filters' combination for colorful images; rich color in your lens;
• Resistant of BORTLE 8; the multi-narrowband filters can be resistant from Bortle 1 to Bortle 8 cities, suitable for almost all urban;
• 300-1100 mm working wavelength; the wider coverage of this multi-narrowband filter allows it to have a strong ability to tack light pollution.

Note: Optical filters that use infrared light often cause halos in the NIR region; which are exacerbated by the halos produced by the filter itself.

IR 850nm Pass Filter is suitable for IR sensitive cameras.

• Darkens the background during twilight.
• Imaging of bright planets, stars, and comets by day.
• Imaging of young stars in dust clouds and stellar nurseries.
• Filter thickness: 11mm.

• Universal Light Suppression: Effectively reduces artificial lighting (mercury, sodium, and LED) while enhancing Hα, Hβ, OIII, and SII emission lines.
• Premium Optics: Features 2mm Schott® B270 optical glass with IBAD (Ion beam-assisted deposition) technology for superior durability.
• Nano Coating: Double-sided NANO anti-smudge coating provides excellent water and grease resistance.
• Pro Frame: Matte black anodized and Teflon-coated frame eliminates reflections and flares.
• Usage Tip: Recommended for SLR lenses with a focal length of 60mm or more to prevent color shift.
• Versatile Design: Specifically designed for Astro-Adapter M48-M56 P0.75mm telescope connections.

Professional 31.75 mm (1.25 in) narrowband H-Alpha astrophotography filter designed to capture intricate details of emission nebulae under heavily light-polluted skies.

• Ultra-Narrow Bandwidth: 7 nm FWHM centered at 656.3 nm (H-Alpha line emitted by ionized hydrogen).
• High Peak Transmission: Over 85%–90% transmittance at the critical 656.3 nm wavelength.
• Extreme Light Pollution Cutoff: Complete blocking from 300 nm to 1100 nm, suppressing sodium (Na) and mercury (Hg) artificial streetlights.
• Advanced Optical Substrate: Double-sided polished optical glass with flatness of 1/4λ and parallelism under 30 arcseconds.
• IAD Multi-Coating: Ion-Assisted Deposition coating technology prevents temperature-induced spectral drift.
• Premium CNC Frame: Anodized aluminum housing with M28.5*0.6 thread and anti-reflection internal extinction finish.

Astrodon SII5_36R Narrowband Filter for Astrophotography

♦ 36mm Narrowband Filter - unmounted

♦ Emission line: S-II Sulphur 5nm bandwidth

♦ Thickness: 3mm - parfokal with all other Astrodon filters

♦ Transmission: better than 90%

♦ Image left shows the curve of the 3nm filter.

Astrodon OIII5_36R Narrowband Filter for Astrophotography

♦ 36mm Narrowband Filter - unmounted

♦ Emission line: O-III 5nm bandwidth

♦ Thickness: 3mm - parfokal with all other Astrodon filters

♦ Transmission: better than 90%

♦ Image left shows the curve of the 3nm filter

Optolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

• Isolates emissions of nebulae into H-Alpha and OIII
• Compatible with DSLR, color/monochrome CMOS, and CCD cameras
• Muli-layers of anti-reflection coating
• High density sponge carton lining

Astrodon 5nm H-alpha Filter is the perfect tool for your imaging set up in order to knockout Hydrogen gas and pick up faint details

Astrodon HA5_36R H-Alpha Narrowband Filter for Astrophotography

♦ 36mm Narrowband Filter - unmounted

♦ Emission line: H-Alpha 5nm bandwidth

♦ Thickness: 3mm - parfokal with all other Astrodon filters

♦ Transmission: better than 90%

Capture the cosmos in stunning "Hubble Palette" detail. This professional ZWO 36mm unmounted filter set includes H-Alpha, OIII, and SII narrowband filters with a sharp 7nm bandpass. Optimized for deep-sky astrophotography, these filters feature fine-optical polishing to 1/4 wave accuracy and multi-layer AR coatings to eliminate reflections and reveal the hidden structures of nebulae.

Application and Performance:

• High transmittance and smallest bandwidth to maximize contrast
• Steep spectral profile minimizes halos around bright stars
• A single substrate to eliminate internal reflections
• Narrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
• Use in light polluted areas and dark sites
• Extends imaging time when the moon is up
• Antlia narrowband Pro filters can be used down to f/3 systems with minimal loss of signal
• All Antlia unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light
• Superior optical reliability reduces post image processing
• This filter is only effective for deep sky objects that contain OIII emissions

Application and Performance:

• High transmittance and smallest bandwidth to maximize contrast
• Steep spectral profile minimizes halos around bright stars
• A single substrate to eliminate internal reflections
• Narrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
• Use in light polluted areas and dark sites
• Extends imaging time when the moon is up
• Antlia narrowband Pro filters can be used down to f/3 systems with minimal loss of signal
• All Antlia unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light
• Superior optical reliability reduces post image processing
• This filter is only effective for deep sky objects that contain H-alpha emissions
  
  

Astrodon E-Series L-RGB Filters for better colors with KAF Sensors and Sony Sensors

♦ Set of 4 Filters L-RGB - 36mm unmounted

♦ Better colors with KAF8300, KAF3200, KAF6303, KAF16200, KAF16803 sensors, as well as most Sony and back-thinned sensors.

♦ Astrodon filters are coated to the edge

Application and Performance:

• High transmittance and smallest bandwidth to maximize contrast
• Steep spectral profile minimizes halos around bright stars
• A single substrate to eliminate internal reflections
• Narrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants
• Use in light polluted areas and dark sites
• Extends imaging time when the moon is up
• Antlia narrowband Pro filters can be used down to f/3 systems with minimal loss of signal
• All Antlia unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light
• Superior optical reliability reduces post image processing
• This filter is only effective for deep sky objects that contain SII emissions

Application and Performance:

1. Designed for monochrome CCD and CMOS cameras

2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae

3. AR anti-reflection film design for secondary reflection and star halo reduction

4. R-Filter provides maximum transmission of H-alpha and S II emission

5. B/G overlap doubles the energy in the OIII line

6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems

7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light

8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances

9. Not recommended for Solar observing and imaging

10. Not recommended for visual observation