- SVBNOY H-Alpha 5nm 2" Filter blocks the transmission of contrast-killing light pollution wavelengths; improve contrast and detail;
- This H-Alpha filter also blocks infrared wavelengths from 700nm to 1000nm so you don't need a separate IR-Cut filter
- Allowing 5nm bandwidth of light centered on a wavelength of 656.3nm to pass through; 90% transmission;
- Astrophotography under a light-polluted night sky can be difficult; the solution is an H-alpha filter; the H-alpha cut-off filter works to filter out a large part of this light pollution;
- 2 inch mounted; the filter can thread directly into the 2 inch barrel of your telescope eyepiece.
Note: This OIII filter is NOT for use on the Sun, and also unsuitable for telescopes with a focal ratio below F/5.
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| Model | SV227 |
| Type | H-Alpha Filter |
| Size | 2-Inch |
| Wavelength Range | 300-1000nm |
| CWL | 656.3nm |
| 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. H-Alpha 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 656.3nm;
- 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. 2 inch mounted; metal filter cell threads directly into the 2 inch barrel of your telescope eyepiece.