ALP-T Dual Band Ha & OIII 3nm + SII & Hb 3.5nm 2" Filter Set
Antlia
~$736.80
1 stores
The Antlia ALP-T Dual Band filter set combines two ultra-narrowband filters for four-channel narrowband imaging with one-shot color (OSC) cameras. This set includes a 3nm Ha&OIII filter (passes H-alpha at 656.3nm and OIII at 500.7nm) paired with a 3.5nm SII&H-beta filter (passes Sulfur-II at 672.4nm and Hydrogen-Beta at 486.1nm), enabling astrophotographers to capture four distinct emission lines simultaneously. The advanced multi-coating technology achieves optical density 4.5 suppression on unwanted wavelengths, effectively blocking light pollution, moonlight, and airglow while delivering superior signal-to-noise ratios and exceptional nebula contrast. Ideal for OSC cameras and suitable for telescopes with focal ratios slower than f/4, this set supports false-color processing and traditional RGB luminance enhancement.
Specifications
| Light Pollution Suppression Range | Bortle 1-8 |
| Sulfur-II Wavelength | 672.4 |
| Camera Type | OSC DSLR CMOS CCD |
| Filter Type | Dual Narrowband |
| OIII Wavelength | 500.7 |
| Hydrogen-Beta Wavelength | 486.1 |
| Coating Technology | Ion Gun Assisted Deposition |
| NIR Blocking | Up to 1100nm |
| Ha OIII Bandwidth | 3 |
| SII Hb Bandwidth | 3.5 |
| Optical Density on Unwanted Wavelengths | 4.5 |
| H-Alpha Wavelength | 656.3 |
| Filter Mount Size | 2 in |