Antlia Sulfur II (SII) 7nm Prime Narrowband 36mm Filter (ANT-SII-7NM-PRIME-36MM)
ANT-SII-7NM-PRIME-36MM
Antlia Sulfur II (SII) 7nm Prime Narrowband 36mm Filter (ANT-SII-7NM-PRIME-36MM)
ANT-SII-7NM-PRIME-36MM
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Product Description
Antlia Prime narrowband filters optimize the FWHM (full width half maximum) to 7nm bandpass. The suppression of optical density is (OD) 4 on unwanted wavelengths.The excellent optical coating characteristics found in the Antlia 3nm Pro series has been incorporated into the 7nm Prime narrowband filters.
The result is that these filters deliver superior SNR (signal to noise ratio) and better contrast in your images. Antlia 7nm Prime filters are designed to deliver 90% transmittance at the SII/Ha/OIII lines that provides you with the maximum signal and well-defined nebulae structures. Besides, the H-alpha filter is wide enough (7nm bandwidth) to pass emission lines at NII 654.8nm and NII 658.3nm.
The out of band blocking specification is rated OD4 (0.01%) which delivers an excellent SNR (signal to noise ratio) and effective cut-off rate to minimize interference from other wavelengths.Improved sharp cut off astrophotography 7nm Prime filters are designed to minimize halos around bright stars. Antlia 7nm Prime filters can be used with nearly all systems as fast as f/2 with minimal loss in emission signal and meets the requirements of fast optics.
Main Features
- 90% transmittance at Central Wavelength line
- With wider FWHM, 7nm Prime narrowband filters can be used with fast optics of f/2 with minimal loss of signal Steep spectral profile minimizes halos around bright stars
- Use in light polluted areas and dark sites
- All Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light
- Superior optical reliability reduces post image processing
Specifications
| Model | Sulfur II | Hydrogen-Alpha | Oxygen III |
| FWHM | 7nm | 7nm | 7nm |
| CWL (Central Wavelength) | 671.6nm | 656.3nm | 500.7nm |
| Peak Transmission | >90% | >90% | >85% |
| Blocking | ≥OD4 @ 300-1000nm | ≥OD4 @ 300-1000nm | ≥OD4 @ 300-1000nm |
| Filter Thickness | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm |
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