SV240 Multi-Narrowband Filter Galaxy & Nebula NIR Near-infrared Light Pollution 2" Mounted for Urban Astrophotography

SV240 2inch Multi-Narrowband Filter 

SVBONY SV240 multi-bandpass filter is designed for urban astrophotography; it can isolate the Ha; OIII; and H-Beta from the background light pollution efficiently; you can astrophotography in urban without a long struggle to suburbs; save your time and high efficiency; and it is suitable for photoing most galaxies; reflection nebulae; emission nebula; and star clusters; and so on.

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. The SV240 narrowband filter can block the influence of urban light pollution and other background lights efficiently. 

FWHM; 24nm; 20 nm; 115 nm; the wide wavelength and high transmittance of this multi-bandpass filters in Ha; OIII; H-Beta wavelength helps the colorful image photoing.

Resistant of BORTLE 8

The multilayer coating design for the remarkable performance in tacking light pollution and high transmittance in core wavelength. Astrophotography in urban comfortable. The strong ability to tacking light pollution up to BORTLE 8 allows it can be used in multiple cities, and no need to go to the suburbs. Time and labor saving.

Wavelength Range of The Filter

The wide range allows the filter to be used in multiple scenarios. Stronger resistance to light pollution. Near IR (NIR) is blocked up to 1100nm. High ability to process the wavelength from 300 to 1100nm. Effectively isolate the light pollution band.

Average Transmittance >90% 

Photography All Kinds of Targets

The wavelength can meet the astrophotography needs of most galaxies, reflection nebulae, emission nebula, star clusters, and other broad-spectrum targets. And the targets can be captured in a short time, which is widely used and high efficiency. 

If you have different astrophotography systems, no need to prepare dedicated filters; one SV240 can meet your needs due to its high compatibility. Considering the high quantum efficiency (QE) characteristics of the latest cameras (such as IMX585 and IMX464) in the near-infrared region and also this region less susceptible to artificial light pollution, 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.

2. Feature

4. 1.Can be used to image most deep sky objects, including galaxies, reflection nebulae, emission nebula, and star clusters from a Bortle 1 location to Bortle 8; 
   2.Multi-Narrowband filter properly designed for astrophotography both in light polluted, allows for imaging in bright man-made light pollution and moonlit conditions;
   3.Take color images without needing to combine images with multiple filters, most useful for One-Shot Color cameras;
   4.High transmittance of the main emission lines Ha/OIII/H-Beta in the visible region enhances SNR and contrast;
   5.Passing near-infrared region is for shooting deep sky objects that cannot be imaged with other filters without NIR transmission.

7. FAQ

9. Q: What is the difference with SVBONY SV220 mainstream dual narrowband astrophotography filters?
   A: Dual narrowband filters are mainly used for emission nebulae, planetary nebula, and supernova remnants astrophotography. SV240 can be used for both traditional emission nebulae and galaxies, reflection nebulae, and star clusters.

1. Q: Which equipment can be used with SV240？
   A: Because SV240 has high transmittance in the near-infrared region, we recommend NIR-enhanced sensors, such as the IMX585 and IMX464. The filter is more suitable for cameras with AR protective glass as they can capture both NIR and visible band signals.

1. Q: Do these filters produce halos? What kind of primary mirror are recommended?
   A: Using the infrared astrophotography filter will often cause halos in near-infrared; We recommend using SV240 with a reflective or APO refractor. (The SV240 filter utilizing infrared tend to cause haloing in the NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (optical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.)

1. Q: Does the SV240 filter provide an improvement in photoing broadband galaxy targets?
   A: Yes, SV240 can be seen as the combination of SV220 and UHC filters, and has remarkable performance both in narrowband and broadband targets. 
2. 1. Q: Is the SV240 filter suitable for visual observation?
      A: No, the multi-narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun.