SV227 SHO 5nm 2" Filter Set SII H-Alpha OIII Narrowband Astronomical Photographic CCD Filter for Deep Sky
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Key Features
The SHO 5nm filter set includes H-Alpha, OIII, and SII filters, providing precise narrowband imaging for capturing stunning details of emission nebulae and deep-sky objects.
With a 5nm bandwidth, these filters allow for high-contrast images and exceptional clarity, ensuring your astrophotography captures the finest details in the night sky.
Made from high-quality optical glass, the filters provide superior light transmission and minimal distortion, offering accurate color rendition and excellent contrast.
Designed for use in harsh astrophotography environments, the SHO 5nm filter set is built to endure long exposure times, providing consistent, reliable performance.
This filter set is designed to fit most 1.25-inch telescope eyepieces, offering easy installation and compatibility with a wide range of telescope setups for both amateurs and professionals.
SHO
SHO-Filter Drawer
SHO-UV-IR Cut Filter
SHO-IR Pass Filter
⚡ Shipped: 72 hrs after ordering (Pre-sale products excluded).
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The Wavelength of SV227
Standard 2inch Size
Peak Transmittance
M48x0.75 Thread
Substrate Thickness 1.85mm
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| Model | SV227 | SV227 | SV227 |
| SKU | W9187DA | W9187DB | W9187DC |
| Type | SII Filter | H-Alpha Filter | OIII Filter |
| Size | 2-Inch | 2-Inch | 2-Inch |
| Wavelength Range | 300-1000nm | 300-1000nm | 300-1000nm |
| CWL | 672nm | 656.3nm | 500.7nm |
| FWHM | 5nm | 5nm | 5nm |
| Peak Transmittance | ≥90% | ≥90% | ≥90% |
| Substrate Thickness | 1.85mm | 1.85mm | 1.85mm |
| Blocking | ≥OD5 | ≥OD5 | ≥OD5 |
| Clear Aperture | 44mm | 44mm | 44mm |
| Surface Quality | 60/40 | 60/40 | 60/40 |
| Surface Parallelism | 1/4λ | 1/4λ | 1/4λ |
| Parallelism | 30" | 30" | 30" |
| Thread | M48x0.75 | M48x0.75 | M48x0.75 |
| Single Thread | Yes | Yes | Yes |
| Net Weight | 12.5g / 0.44oz/0.027lb | 12.5g / 0.44oz/0.027lb | 12.5g / 0.44oz/0.027lb |
Features
- 1. The H-Alpha 5nm is an extremely narrow emission-line filter that works by allowing a 5nm bandwidth of light, centered on the 656nm wavelength through, and blocking the transmission of contrast-killing light pollution wavelengths. Wavelengths that are responsible for natural light pollution, or skyglow, are drastically reduced, as is artificial light pollution caused by high and low pressure sodium vapor and mercury vapor lights. The result is a high contrast image that reveals the H-alpha line in all its glory;
- 2. The Sulfur II 5nm Extra Narrowband Filter transmits a 5nm bandwidth of light that is centered at 672nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all SVBONY filters that are designated as “CCD”, this SII filter also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter;
- 3. The Oxygen III 5nm Extra Narrowband Filter transmits a 5nm bandwidth of light that is centered at 500nm and drastically reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). Like all SVBONY filters that are designated as “CCD”, this OIII also blocks infrared wavelengths from 700nm to 1100nm so you don't need a separate IR-Cut filter.
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