SV240 1.25'' Multi-Narrowband Filter for Urban Astrophotography

SKU: W9191B
US$ 119.99 -50%
List Price: US$ 239.98

Cut-off depth ≥OD4: Highly efficient in blocking urban light pollution or other background light;
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;
Resistant of BORTLE 8: the multi-narrowband filters can be resistant from Bortle 1 to Bortle 8 cities, suitable for almost all urban.

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.

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SV240 1.25inch Multi-Narrowband Filter

The Multi-Narrowband filter is designed for astrophotography, allowing you to capture most deep sky objects, including galaxies, reflection nebulae, emission nebulae, and star clusters, across a range of Bortle conditions (from Bortle 1 to Bortle 8). It is especially effective in light-polluted environments, enabling imaging under bright man-made light and moonlit conditions. Ideal for One-Shot Color cameras, this filter allows you to capture color images without the need for multiple filter combinations. It offers high transmittance of key emission lines (Ha/OIII/H-Beta) in the visible spectrum, enhancing signal-to-noise ratio (SNR) and contrast. Additionally, it passes near-infrared light, enabling imaging of deep sky objects that other filters may not capture.

multi-bandpass filter

The 300-1100 nm working wavelength of this multi-narrowband filter provides wider coverage, enhancing its ability to tackle light pollution.

multi-bandpass filter

multi-bandpass filter

The multi-narrowband filters can be resistant from Bortle 1 to Bortle 8 cities, suitable for almost all urban.

multi-bandpass filter

multi-bandpass filter

If you have different astrophotography systems, no need to prepare dedicated filters; one SV240 can meet your needs due to its high compatibility. The SV240 multi-narrowband filter adds high transmission in the near-infrared (NIR) band. This spectrum design improves the image signal-to-noise ratio and contrast by capturing signal in visible bands and NIR regions while maintaining good colour balance and being easier to manage in post-processing.

multi-bandpass filter

multi-bandpass filter

Real Shot Images

multi-bandpass filter

multi-bandpass filter

multi-bandpass filter

multi-bandpass filter

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Product Specifications 1.25 inches
Mirror Ring Size Φ31.75x7mm
Weight  5.4g
Thread Type Single Thread / Male Thread
Thread Specification M28.5*0.6mm
Material 6061T Aluminum Profile
Processing Technology/Surface Treatment CNC/Blackening and Delustering Oxidation
Substrate Corning EAGLE
Substrate Thickness 2.0mm
Light Aperture 26mm
Single Point Transmittance T>95%@486.1nm
T>92.4%@495.9nm
T>88.2%@500.7nm
T>97%@656.3nm
Infrared Transmittance Band Tavg>98.2%@830-870nm
Wavelength Control Point T=50%@482nm
T=50%@783nm
Cut-off Wavelength 300-450nm&560-620nm&690-750nm&940-1100nm
Bandwidth/FWHM 25nm&22nm&115nm
Cut-off depth Average >OD5 (0.0006%) & Average>OD4 (0.004%) & Average>OD2 (0.39%) & Average>OD3 (0.08%)
Surface quality 60/40
Surface parallelism λ/2

Package includes:

Packing box*1
PP Material Plastic Box*1
SVBONY 1.25" Multi-Narrowband Filter*1

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