ALP-T Dualband 3nm Ha & OIII
Antlia
From ~$390.10
2 stores
In stock
The Antlia ALP-T Dualband 3nm Ha & OIII filter is a dual narrowband filter engineered for one-shot color (OSC) cameras to capture high-contrast deep-sky nebulae images by isolating H-alpha and OIII emission lines while effectively blocking light pollution, moonlight, and airglow. With an ultra-narrow 3nm FWHM passband and optical density of 4.5 on unwanted wavelengths, it delivers superior signal-to-noise ratio and exceptional contrast even in bright skies. When paired with Antlia's complementary 3.5nm SII & H-beta filter, it enables true four-channel narrowband imaging (Ha/OIII/SII/Hb) for advanced false-color processing and detailed nebulae imaging.
Specifications
| Filter Type | Dual Narrowband |
| FWHM Bandwidth | 3 |
| Passband Wavelength Ha | 656.3 |
| Filter Mount Size | 2 in |
| Light Pollution Suppression Range | Bortle 1-8 |
| Coating Technology | Ion Gun Assisted Deposition multi-layer coating |
| Passband Wavelength OIII | 500.7 |
| Recommended Focal Ratio | f/4 or slower |
| Optical Density | 4.5 |
| Camera Type Optimized | One-shot Color (OSC), DSLR, CMOS, CCD |