Antlia SLOAN/SDSS (griz') Photometric Imaging Filter Set of Four Filters - 50mm 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.
The Sloan Digital Sky Survery (SDSS) photometric system is the most common filter set used by observatories today. Antlia Photometric Sloan filter set includes four filters covering 401nm to the sensitivity limit of silicon CCD cameras near 1100nm. Ion Gun Assisted Deposition coating technology on the double-sided polished substrate makes them the most consistent, durable and accurate filters. Antlia Sloan filters have almost total suppression of optical density (OD)5, the result is that our photometric sloan filters minimize the already small leakage and create superior contrast.
Application and Performance
- Additional separation was included between the g' and r' filters to better avoid atmospheric sky glow line at 558nm
- Wider transmission windows, which allow fainter objects to be measured in a shorter time
- Antlia Sloan griz' filter set is suitable from f/15 to f/1.8
- Peak transmission guaranteed > 98%（g’＞95%）
Technical Specifications
- Wavelength:
- g': 401-550nm
- r': 562-695nm
- i': 695-844nm
- z': ＞820nm
- Peak Transmission:
- g': 95%
- r': 98%
- i': 98%
- z': 98%
- Blocking: ≥OD5
- Filter Thickness: 3mm+/-0.05mm
- 1/4-wave propagated wavefront prior to coating
- Identical filter thickness to existing standards, with utmost care for parfocality
- Each filter coated individually, NOT cut out of a larger plate with coatings
Other Information
- Country of Manufacture: China
The Sloan Digital Sky Survery (SDSS) photometric system is the most common filter set used by observatories today. Antlia Photometric Sloan filter set includes four filters covering 401nm to the sensitivity limit of silicon CCD cameras near 1100nm. Ion Gun Assisted Deposition coating technology on the double-sided polished substrate makes them the most consistent, durable and accurate filters. Antlia Sloan filters have almost total suppression of optical density (OD)5, the result is that our photometric sloan filters minimize the already small leakage and create superior contrast.
Application and Performance
- Additional separation was included between the g' and r' filters to better avoid atmospheric sky glow line at 558nm
- Wider transmission windows, which allow fainter objects to be measured in a shorter time
- Antlia Sloan griz' filter set is suitable from f/15 to f/1.8
- Peak transmission guaranteed > 98%（g’＞95%）
Technical Specifications
- Wavelength:
- g': 401-550nm
- r': 562-695nm
- i': 695-844nm
- z': ＞820nm
- Peak Transmission:
- g': 95%
- r': 98%
- i': 98%
- z': 98%
- Blocking: ≥OD5
- Filter Thickness: 3mm+/-0.05mm
- 1/4-wave propagated wavefront prior to coating
- Identical filter thickness to existing standards, with utmost care for parfocality
- Each filter coated individually, NOT cut out of a larger plate with coatings
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.
The Sloan Digital Sky Survery (SDSS) photometric system is the most common filter set used by observatories today. Antlia Photometric Sloan filter set includes four filters covering 401nm to the sensitivity limit of silicon CCD cameras near 1100nm. Ion Gun Assisted Deposition coating technology on the double-sided polished substrate makes them the most consistent, durable and accurate filters. Antlia Sloan filters have almost total suppression of optical density (OD)5, the result is that our photometric sloan filters minimize the already small leakage and create superior contrast.
Application and Performance
- Additional separation was included between the g' and r' filters to better avoid atmospheric sky glow line at 558nm
- Wider transmission windows, which allow fainter objects to be measured in a shorter time
- Antlia Sloan griz' filter set is suitable from f/15 to f/1.8
- Peak transmission guaranteed > 98%（g’＞95%）
Technical Specifications
- Wavelength:
- g': 401-550nm
- r': 562-695nm
- i': 695-844nm
- z': ＞820nm
- Peak Transmission:
- g': 95%
- r': 98%
- i': 98%
- z': 98%
- Blocking: ≥OD5
- Filter Thickness: 3mm+/-0.05mm
- 1/4-wave propagated wavefront prior to coating
- Identical filter thickness to existing standards, with utmost care for parfocality
- Each filter coated individually, NOT cut out of a larger plate with coatings
Other Information
- Country of Manufacture: China
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Antlia SLOAN/SDSS (griz') Photometric Imaging Filter Set of Four Filters - 50mm Round Unmounted