Antlia 2.5nm Narrowband Oxygen III (OIII) Ultra Filter - 2" Mounted
Antlia
Antlia 2.5nm Narrowband Oxygen III (OIII) Ultra Imaging Filter - 2" Mounted is a narrowband filter in 2" for mono emission-line imaging.
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Specifications
Filter
- Filter type
- Single-line narrowband filter
- Filter size
- 2" / Mounted
Spectral
- Passbands
- OIII 500.7 nm (2.5 nm)
- Band count
- 1 band
- Narrowest bandpass
- 2.5 nm
Specifications
- Transmission
- 92%
- Thickness
- 2 mm
Use
- Camera use
- Mono astronomy cameras
Astrophotography Fit
Best for isolating emission lines with a mono camera and filter wheel.
Antlia 2.5nm Narrowband Oxygen III (OIII) Ultra Imaging Filter - 2" Mounted is a midrange narrowband filter (2").
Best for isolating emission lines with a mono camera and filter wheel.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
- Monochrome camera, matching filter wheel, and autofocus offsets
- Ha/OIII/SII emission nebula projects
- Long integrations with darks, flats, and careful star handling
Not recommended for
- Unmodified color cameras as the primary workflow
- Targets dominated by broadband continuum signal
- Users who want natural star color with minimal processing
Where To Buy
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| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Starizona Starizona | $649.00 | In stock Updated 5/12/2026 | View Offer - $649.00 |