Product Detail
SV240 1.25'' Multi-Narrowband Filter for Urban Astrophotography
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.
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.
The 300-1100 nm working wavelength of this multi-narrowband filter provides wider coverage, enhancing its ability to tackle light pollution.
The multi-narrowband filters can be resistant from Bortle 1 to Bortle 8 cities, suitable for almost all urban.
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.
Real Shot Images
| 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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