Antlia O-III and H-Beta Photo-Visual Filter - 1.25" Mounted
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The Antlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by the Antlia HB-OIII filter.
When it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.
Application and Performance:
The Antlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation andphotography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background andproducesnear-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under bothlight-polluted and dark skies.
Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.
Technical Data:
- CWL (Central Wavelength):
- Oxygen III: 500.7nm
- Oxygen III: 495.9nm
- H-Beta: 486.1nm
- Peak Transmission:
- Oxygen III: >90%
- Oxygen III: >90%
- H-Beta: >90%
- Blocking: OD4@ 300-1000nm
- Filter Thickness: 2mm+/-0.05mm
- Basic Substrate: Optical, Single, Non-glued substrate
- 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:
- 1.25" (M28.5x0.6)
- Ultra-thin filter cell to minimize vignetting
- Black anodized finish
- Laser engraving No fading
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 31.5 mm / 1.24 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.7mm / 0.18 in
M = Male Thread Length = 2.5 mm / 0.09 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 25.5 mm / 1.00 in
Other Information
- Country of Manufacture: China
The Antlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by the Antlia HB-OIII filter.
When it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.
Application and Performance:
The Antlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation andphotography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background andproducesnear-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under bothlight-polluted and dark skies.
Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.
Technical Data:
- CWL (Central Wavelength):
- Oxygen III: 500.7nm
- Oxygen III: 495.9nm
- H-Beta: 486.1nm
- Peak Transmission:
- Oxygen III: >90%
- Oxygen III: >90%
- H-Beta: >90%
- Blocking: OD4@ 300-1000nm
- Filter Thickness: 2mm+/-0.05mm
- Basic Substrate: Optical, Single, Non-glued substrate
- 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:
- 1.25" (M28.5x0.6)
- Ultra-thin filter cell to minimize vignetting
- Black anodized finish
- Laser engraving No fading
The Antlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by the Antlia HB-OIII filter.
When it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.
Application and Performance:
The Antlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation andphotography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background andproducesnear-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under bothlight-polluted and dark skies.
Since human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer's eyes.
Technical Data:
- CWL (Central Wavelength):
- Oxygen III: 500.7nm
- Oxygen III: 495.9nm
- H-Beta: 486.1nm
- Peak Transmission:
- Oxygen III: >90%
- Oxygen III: >90%
- H-Beta: >90%
- Blocking: OD4@ 300-1000nm
- Filter Thickness: 2mm+/-0.05mm
- Basic Substrate: Optical, Single, Non-glued substrate
- 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:
- 1.25" (M28.5x0.6)
- Ultra-thin filter cell to minimize vignetting
- Black anodized finish
- Laser engraving No fading
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 31.5 mm / 1.24 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.7mm / 0.18 in
M = Male Thread Length = 2.5 mm / 0.09 in
F = USABLE Female Filter Thread Length = Not threaded, so you cannot stack additional filters
S = Glass Substrate Thickness = 2 mm / 0.07 in
CA = Clear Aperture = 25.5 mm / 1.00 in
Other Information
- Country of Manufacture: China
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Antlia O-III and H-Beta Photo-Visual Filter - 1.25" Mounted