SVBONY SV160 · W9121B · 2″ OIII · 7nm
Isolate oxygen emission. Reveal nebula structure.
A single-band oxygen-III filter for building dedicated OIII imaging data and combining it with your other narrowband channels.
The SVBONY SV160 2-inch OIII 7nm filter is a mounted narrowband astrophotography filter for recording oxygen-III emission from suitable nebulae. Its nominal 7nm passband around 500nm helps reject unwanted background light while retaining the oxygen signal used in deep-sky imaging.
A dedicated OIII channel for narrowband imaging
This filter is particularly useful with a monochrome astronomy camera when collecting a separate oxygen channel. Combine OIII data with separately captured H-alpha for a bicolour image, or add SII for a three-channel SHO workflow. H-alpha and SII filters are separate accessories.
Suitable subjects include planetary nebulae and other nebulae with oxygen emission. The filter is less useful for broadband targets such as galaxies, reflection nebulae and star clusters, where rejecting most of the spectrum also removes much of the target’s light.
2-inch mounted format
The filter fits compatible M48 × 0.75 threaded holders, drawers and filter wheels that accept mounted 2-inch filters. The manufacturer-hosted review lists a 45mm clear aperture. Check your holder’s cell clearance and the filter-to-sensor distance: the mounted size alone does not guarantee an unvignetted image on every sensor.
Specifications
| Brand / model | SVBONY / SV160 |
|---|---|
| Manufacturer SKU | W9121B |
| Filter type | Single-band oxygen-III narrowband imaging filter |
| Mounted size | 2-inch |
| Nominal bandwidth | 7nm |
| Nominal passband centre | Approximately 500nm, targeting OIII emission |
| Mounting thread | M48 × 0.75 |
| Clear aperture | 45mm |
Practical imaging advice
Set exposure time and total integration for your target and equipment rather than assuming one fixed setting. Bright-star halos can occur with narrowband filters and depend on the optical train; this filter should not be treated as halo-free. For very fast optics, check interference-filter suitability before ordering.
This listing supplies one W9121B OIII filter, not a complete SHO set. A camera, telescope and compatible holder are required separately.
For astrophotography. This is not a solar filter.
Browse our SVBONY telescope filters or ask Dark Clear Skies for help choosing the correct filter format.
