SV227 OIII 5nm 2" Filter Narrowband Astronomical Photographic CCD Filter for Deep Sky
2 | ReviewsKey Features
- Enhanced OIII Imaging
- 5nm Bandwidth for Precision
- Superior Optical Quality
- Built to Last
- Universal Compatibility
Note: This OIII filter is NOT for use on the Sun, and also unsuitable for telescopes with a focal ratio below f/4
Customer Reviews
LEO YU
Dec 27, 2024
I switched to true mono imaging this summer, been using these filters for a few months now. Both myself and the members of my local astronomy club have been very impressed with what results these filters were able to produce. Way better value than other name brand and SVBONY spec their 5nm as a true FWHM measurement Compared to some amazon brand that's cheaper but look closely! the other amazon brand try to say 495-501 on their chart but if you look closely the FWHM on those chart seem closer to 10-15nm, those may work for visual, but not astrophotography.
Skywatcher Simon
Aug 19, 2021
I bought the filter in 2 "for my Svbony SV503 102/714 refractor and my Skywatcher 250P Newton. The filter does exactly what it should. It lets the light of the ionized oxygen through between 495nm and 500nm. I tested it together with the Baader UHC-S filter. The Svbony OIII Filter emphasized the contrast on different nebulae more than the UHC. I noticed a difference in particular with the dumbbell nebula and the ring nebula. I was very pleased. I can absolutely recommend the filter for observation.
| Model | SV227 |
| Type | OIII Filter |
| Size | 2-Inch |
| Wavelength Range | 300-1000nm |
| CWL | 500.7nm |
| 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. 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.
