Antlia Narrowband 7nm H-Alpha (Ha) Prime Imaging Filter - 36mm Round Unmounted
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IMPORTANT: Please read this important note below before buying Antlia narrowband filters. No returns will be accepted for Antlia narrowband filters exhibiting halos around bright stars as disclosed below.
Please note that some users may see halos around bright stars in images made with this filter. Such halos have been observed with filters from other leading manufacturers and in the previous generation of Antlia narrowband filters as well. These halos can be caused and/or made worse by other optical accessories in the imaging train, their relative positions, telescope design/optics, camera, software, or a combination thereof. In general, OIII filters seem to have a higher propensity to show halos compared to H-alpha or S-II filters, but in rare cases the latter filters can also exhibit faint halos around bright stars.
Antlia has made great strides in their coatings to minimize haloing of bright stars, but you may still observe this effect to some degree. See the sample OIII image below of Alnitak (magnitude 1.74) and IC434 in Orion (SkyRover 155mm Apo, ZWO 6200MM-P Camera, 20 min exposure) provided by Antlia. In most cases, haloing will not affect your image unless you have very bright stars in the field of view.
Please note we are unable to accept returns of any Antlia narrowband filters if you do observe this haloing effect in your images.
If you must ensure there are no detectable halos in your images, you may want to consider Astrodon or Chroma narrowband filters instead. These filters, however, cost two to three times as much as Antlia 3nm filters do. Antlia is being honest and upfront. They are the ones telling us about these halos, that their filters are great for the money but still not as good as Astrodon/Chroma, and pointing out that with this full disclosure, they will not accept returns. They are leaving it up to the customer to decide if this is good enough for them or not. We believe that for most imaging applications, Antlia filters continue to offer excellent value for astrophotographers and these continue to be among our top sellers.
Antlia H-alpha Prime narrowband filter optimizes 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 H-alpha 7nm Prime filters are designed to deliver 90% transmittance at the CWL Ha 656.3nm lines that provides you with the maximum signal and well-defined nebulae structures. Besides, it 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.
Application and Performance:
- 90% transmittance at Central Wavelength H-alpha 656.3nm line
- FWHM is wide enough to pass both H-alpha and NII lines
- 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
- A single substrate to eliminate internal reflections
- Narrowband Objects: H-alpha,NII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
- 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
- This filter is effective for deep sky objects that contain H-alpha and NII emissions
Technical Data:
- Basic Substrate: Optical, Single / Non-glued substrate
- Filter Thickness: 2mm+/-0.05mm for 36mm unmounted
- FWHM (Full width at half maximum): 7nm
- CWL (Central Wavelength): 656.3nm
- Peak Transmission: ＞90%
- Blocking: > 4OD(0.01% out of band blocking) @ 300-1000nm
- Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
- Transmitted Wavefront: Lambda/4 or better
- Parallelism: less than 30 arcsec
Filter Ring:
- None. 36mm round diameter, unmounted
Not Recommended:
- Solar Observing and imaging
- Visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.
Other Information
- Country of Manufacture: China
Antlia H-alpha Prime narrowband filter optimizes 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 H-alpha 7nm Prime filters are designed to deliver 90% transmittance at the CWL Ha 656.3nm lines that provides you with the maximum signal and well-defined nebulae structures. Besides, it 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.
Application and Performance:
- 90% transmittance at Central Wavelength H-alpha 656.3nm line
- FWHM is wide enough to pass both H-alpha and NII lines
- 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
- A single substrate to eliminate internal reflections
- Narrowband Objects: H-alpha,NII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
- 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
- This filter is effective for deep sky objects that contain H-alpha and NII emissions
Technical Data:
- Basic Substrate: Optical, Single / Non-glued substrate
- Filter Thickness: 2mm+/-0.05mm for 36mm unmounted
- FWHM (Full width at half maximum): 7nm
- CWL (Central Wavelength): 656.3nm
- Peak Transmission: ＞90%
- Blocking: > 4OD(0.01% out of band blocking) @ 300-1000nm
- Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
- Transmitted Wavefront: Lambda/4 or better
- Parallelism: less than 30 arcsec
Filter Ring:
- None. 36mm round diameter, unmounted
Not Recommended:
- Solar Observing and imaging
- Visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.
IMPORTANT: Please read this important note below before buying Antlia narrowband filters. No returns will be accepted for Antlia narrowband filters exhibiting halos around bright stars as disclosed below.
Please note that some users may see halos around bright stars in images made with this filter. Such halos have been observed with filters from other leading manufacturers and in the previous generation of Antlia narrowband filters as well. These halos can be caused and/or made worse by other optical accessories in the imaging train, their relative positions, telescope design/optics, camera, software, or a combination thereof. In general, OIII filters seem to have a higher propensity to show halos compared to H-alpha or S-II filters, but in rare cases the latter filters can also exhibit faint halos around bright stars.
Antlia has made great strides in their coatings to minimize haloing of bright stars, but you may still observe this effect to some degree. See the sample OIII image below of Alnitak (magnitude 1.74) and IC434 in Orion (SkyRover 155mm Apo, ZWO 6200MM-P Camera, 20 min exposure) provided by Antlia. In most cases, haloing will not affect your image unless you have very bright stars in the field of view.
Please note we are unable to accept returns of any Antlia narrowband filters if you do observe this haloing effect in your images.
If you must ensure there are no detectable halos in your images, you may want to consider Astrodon or Chroma narrowband filters instead. These filters, however, cost two to three times as much as Antlia 3nm filters do. Antlia is being honest and upfront. They are the ones telling us about these halos, that their filters are great for the money but still not as good as Astrodon/Chroma, and pointing out that with this full disclosure, they will not accept returns. They are leaving it up to the customer to decide if this is good enough for them or not. We believe that for most imaging applications, Antlia filters continue to offer excellent value for astrophotographers and these continue to be among our top sellers.
Antlia H-alpha Prime narrowband filter optimizes 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 H-alpha 7nm Prime filters are designed to deliver 90% transmittance at the CWL Ha 656.3nm lines that provides you with the maximum signal and well-defined nebulae structures. Besides, it 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.
Application and Performance:
- 90% transmittance at Central Wavelength H-alpha 656.3nm line
- FWHM is wide enough to pass both H-alpha and NII lines
- 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
- A single substrate to eliminate internal reflections
- Narrowband Objects: H-alpha,NII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants
- 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
- This filter is effective for deep sky objects that contain H-alpha and NII emissions
Technical Data:
- Basic Substrate: Optical, Single / Non-glued substrate
- Filter Thickness: 2mm+/-0.05mm for 36mm unmounted
- FWHM (Full width at half maximum): 7nm
- CWL (Central Wavelength): 656.3nm
- Peak Transmission: ＞90%
- Blocking: > 4OD(0.01% out of band blocking) @ 300-1000nm
- Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
- Transmitted Wavefront: Lambda/4 or better
- Parallelism: less than 30 arcsec
Filter Ring:
- None. 36mm round diameter, unmounted
Not Recommended:
- Solar Observing and imaging
- Visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.
Other Information
- Country of Manufacture: China
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Antlia Narrowband 7nm H-Alpha (Ha) Prime Imaging Filter - 36mm Round Unmounted