SV240 Multi-Narrowband Filter Galaxy & Nebula NIR Near-infrared Light Pollution 2" Mounted for Urban Astrophotography
- 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.
Feature
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.
FAQ
Q1: What is the difference with SVBONY SV220 mainstream dual narrowband astrophotography filters?
A1: 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.
Q2: Which equipment can be used with SV240?
A2: 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.
Q3: Do these filters produce halos? What kind of primary mirror are recommended?
A3: 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.)
Q4: Does the SV240 filter provide an improvement in photoing broadband galaxy targets?
A4: Yes, SV240 can be seen as the combination of SV220 and UHC filters, and has remarkable performance both in narrowband and broadband targets.
Q5: Is the SV240 filter suitable for visual observation?
A5: No, the multi-narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun.