SVBONY S-II 1.25" SV160 7 nm Astrophotography Filter
The SVBONY S-II 1.25" SV160 7 nm Filter is a professional astrophotographic filter designed to isolate the ionized sulfur (S-II) emission lines at 671.6 nm and 672.4 nm. With a narrow Full Width at Half Maximum (FWHM) of 7 nm, it delivers outstanding contrast and precision when imaging emission nebulae under light-polluted skies.
Main Features
- High-precision bandpass filter optimized for the S-II emission line
- Made from premium optical glass substrate (B-270)
- Ion-assisted multi-layer coating for durability and wavelength stability
- Excellent suppression of mercury and sodium lamp emissions
- Half bandwidth (FWHM): 7 nm
- Maximum transmission: 80%
- Not recommended for visual or solar observation
Technical Specifications
| Filter Type: | Bandpass Filter |
| Substrate: | Optical Glass B-270 |
| Filter Diameter: | 1.25" |
| Optical Diameter (Aperture): | 26 mm |
| Filter Thickness: | 1.85 mm |
| Pass Bands: | S-II (671.6 nm, 672.4 nm) |
| Central Wavelength (CWL): | 672 nm |
| Half Bandwidth (FWHM): | 7 nm |
| Maximum Transmission: | 80% |
| Blocked Light Pollution Bands: | Mercury (435.8, 546.1, 577–578.1 nm), Sodium (589.6, 598, 615.4–616.1 nm) |
| Optical Density: | OD3 (300–1000 nm) |
| Coating: | Multi-layer coating (MC) |
| Surface Quality: | 60/40 (MIL-O-13830) |
| Flatness: | λ/4 |
| Parallelism: | <30″ |
| Weight: | 5.5 g |
Included in the Box
- SVBONY S-II SV160 1.25" 7 nm Filter
⚠️ Note: This filter is not suitable for visual or solar observation.