The SVBONY Narrowband OIII filter is designed for nebula observation allowing 5nm bandwidth of light centered on a wavelength of 500.7nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high- and low-pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere.
Please Note: This OIII filter is NOT for use on the Sun.
A true OIII Filter that works awesome!
Specifications
| Model | SV227 |
| Type | OIII Filter |
| Size | 2-Inch |
| Wavelength Range | 300-1000nm |
| CWL | 500.7nm |
| 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. SVBONY 2 inch OIII-CCD 5nm Narrow-Band filter for deep sky 2" mounted; can enhances the contrast between the target and the sky; allowing you to capture high-quality images even under the urban sky; suitable for lightly polluted urban areas and relatively dim launch nebulae
2. 5nm Extra Narrowband Filter; 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
3. High-quality materials; the SVBONY 2" Filters are made glass import from germany that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength; or CWL
4. High-level manufacturing process; the filter cell is made of lightweight;strong metal and is CNC machined; sand-blasted; black anodized; and then laser engraved; the result is a super thin filter cell that will produce a clear aperture of 45mm
5. Powerful functionality; 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; make your use more convenient
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