Svbony SV240 multi-narrow band filter

Svbony SV240 Multi-Narrowband Filter Effective Light Pollution Blocking: Cut-off depth of ≥OD4 efficiently isolates Ha, OIII, and H-Beta wavelengths, blocking urban light pollution and background light for astrophotography in city environments, even in Bortle 8 skies. High Compatibility: Designed to work with 99% of astrophotography systems, making it a versatile filter for any setup without needing separate filters. Capture Diverse Targets: Selects Ha, OIII, and H-Beta wavelengths, allowing you to photograph galaxies, reflection nebulae, emission nebulae, and star clusters without needing multiple filters. High Transmittance: With >90% transmittance in Ha, OIII, and H-Beta core wavelengths, this filter ensures bright and detailed imaging of celestial objects. Multi-Bandpass Design: Combines wavelengths into one filter for vibrant, rich colors without needing multiple filter combinations, simplifying your astrophotography workflow. Wide Wavelength Range: Covers 300-1100nm, including the near-infrared (NIR) band, for better light pollution handling and enhanced signal-to-noise ratio, perfect for capturing more detail with modern high-QE cameras. Urban Astrophotography: Ideal for astrophotographers in light-polluted areas, enabling high-quality imaging without the need for long trips to dark-sky locations. Enhanced Color Balance: Maintains excellent color balance and contrast, improving post-processing results and delivering stunning astrophotos. Durable Multi-Coated Design: Features a multilayer coating for optimal performance, ensuring long-lasting durability and consistent results. The Svbony SV240 Multi-Narrowband Filter is an essential tool for urban astrophotography, allowing you to capture breathtaking celestial images with ease and efficiency, no matter where you are. Perfect for both amateur and advanced astrophotographers looking to enhance their imaging experience.   Specifications Brand SVBONY Model SV240 Name Multi-Narrowband Filter Size 2-inch Substrate Thickness 2mm Clear Aperture 44mm Wavelength Range 300-1100nm FWHM 24nm & 20nm & 115nm Blocking >OD5@300-450nm；>OD4@560-620nm；>OD2>690-750nm； >OD3@940-1100nm Peak Transmittance T＞95%@486.1nm；T＞92%@495.9nm；T>85%@500.7nm；T>95%@656.3nm； Tavg>95%@830-870nm Surface Quality 60/40 Surface Parallelism 1/4λ Thread M48x0.75 Single Thread Yes Net Weight 12.5g / 0.44oz /0.027lb   FAQ's 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.