SV227 H-Alpha 5nm Filter 2" Narrowband Astronomical Photographic CCD for Deep Sky
1 | ReviewsOfficial Store Exclusive+8Points
Key Features
- High-Quality H-Alpha Filter
- 5nm Narrowband Precision
- Premium Optical Glass
- Durable and Long-Lasting
- Compatible with 2-Inch Eyepieces
Note: This OIII filter is NOT for use on the Sun, and also unsuitable for telescopes with a focal ratio below f/4
H-Alpha Filter
H-Alpha Filter+2-inch Holder
⚡ Shipped: 72 hrs after ordering (Pre-sale products excluded).
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Customer Reviews
Andy
Aug 29, 2024
Good filter & good price.
| 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 |
| 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.
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