The SVBONY Sulful II 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. This SII filter blocks infrared wavelengths from 700nm to 1000nm so you don't need a separate IR-Cut filter. Due to the narrow bandwidth and high transmission rate of this filter, you will experience a major boost to contrast.
Please Note: This SII filter is NOT for use on the Sun.
In Stock
Specifications
| Model | SV227 |
| Type | SII Filter |
| Size | 2-Inch |
| Wavelength Range | 300-1000nm |
| CWL | 672nm |
| FWHM | 5nm |
| Peak Transmittance | ≥90% |
| Substrate Thickness | 1.85mm |
| Wavelength Range | 300-1000nm |
| Blocking | ≥OD5 |
| Clear Aperture | 44mm |
| Surface Quality | 60/40 |
| Surface Pparallelism | 1/4λ |
| Parallelism | 30" |
| Thread | M48x0.75 |
| Single Thread | Yes |
| Net Weight | 12.5g / 0.44oz/0.027lb |
Features
- 1. SII CCD narrow band filter reduces other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural)
- 2. 300-1000nm Wavelength Range; the SVBONY Sulfur II 5nm Extra Narrowband Filter transmits a 5nm bandwidth of light that is centered at 672nm
- 3. German imported glass; multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition
- 4. CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading
- 5. 1.25 inch mounted; metal filter cell threads directly into the 1.25 inch barrel of your telescope eyepiece