Antlia O-III and H-Beta Photo-Visual Filter - 2" Mounted
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
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 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.
Main Application and Performance:
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 and photography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-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 Specifications:
| Oxygen III | Oxygen III | H-Beta | |
| CWL (Central Wavelength) | 500.7nm | 495.9nm | 486.1nm |
| Peak Transmission | >90% | >90% | >90% |
| Blocking | OD4@ 300-1000nm | OD4@ 300-1000nm | OD4@ 300-1000nm |
| Filter Thickness | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm |
| Basic Substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate |
| Surface Quality | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) |
| Transmitted Wavefront | Lambda/4 or better | Lambda/4 or better | Lambda/4 or better |
| Parallelism | less than 30 arcsec | less than 30 arcsec | less than 30 arcsec |
Filter Ring:
- 1.25’’ (M28.5*0.6)
- 2’’ (M48*0.75)
- Ultra-thin filter cell to minimize vignetting, Black anodized finish, Laser engraving No fading
Not Recommended:
- Solar imaging and observing
Not Permitted:
- DO NOT LOOK AT THE SUN WITH THIS FILTER
- Serious eye damage will result if you fail to observe the warning.
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.9 mm / 0.19 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 = 45 mm / 1.77 in
Other Information
- Country of Manufacture: China
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 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.
Main Application and Performance:
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 and photography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-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 Specifications:
| Oxygen III | Oxygen III | H-Beta | |
| CWL (Central Wavelength) | 500.7nm | 495.9nm | 486.1nm |
| Peak Transmission | >90% | >90% | >90% |
| Blocking | OD4@ 300-1000nm | OD4@ 300-1000nm | OD4@ 300-1000nm |
| Filter Thickness | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm |
| Basic Substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate |
| Surface Quality | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) |
| Transmitted Wavefront | Lambda/4 or better | Lambda/4 or better | Lambda/4 or better |
| Parallelism | less than 30 arcsec | less than 30 arcsec | less than 30 arcsec |
Filter Ring:
- 1.25’’ (M28.5*0.6)
- 2’’ (M48*0.75)
- Ultra-thin filter cell to minimize vignetting, Black anodized finish, Laser engraving No fading
Not Recommended:
- Solar imaging and observing
Not Permitted:
- DO NOT LOOK AT THE SUN WITH THIS FILTER
- Serious eye damage will result if you fail to observe the warning.
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 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.
Main Application and Performance:
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 and photography of nebulae, star clusters, and galaxies more easily.
The HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-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 Specifications:
| Oxygen III | Oxygen III | H-Beta | |
| CWL (Central Wavelength) | 500.7nm | 495.9nm | 486.1nm |
| Peak Transmission | >90% | >90% | >90% |
| Blocking | OD4@ 300-1000nm | OD4@ 300-1000nm | OD4@ 300-1000nm |
| Filter Thickness | 2mm+/-0.05mm | 2mm+/-0.05mm | 2mm+/-0.05mm |
| Basic Substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate | Optical, Single, Non-glued substrate |
| Surface Quality | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) | S/D (scratch/dig) = 60/40 (Refer to MIL-O-13830) |
| Transmitted Wavefront | Lambda/4 or better | Lambda/4 or better | Lambda/4 or better |
| Parallelism | less than 30 arcsec | less than 30 arcsec | less than 30 arcsec |
Filter Ring:
- 1.25’’ (M28.5*0.6)
- 2’’ (M48*0.75)
- Ultra-thin filter cell to minimize vignetting, Black anodized finish, Laser engraving No fading
Not Recommended:
- Solar imaging and observing
Not Permitted:
- DO NOT LOOK AT THE SUN WITH THIS FILTER
- Serious eye damage will result if you fail to observe the warning.
Useful Resources
Filter Cell Specifications
D = Filter Cell Diameter = 50.3 mm / 2.0 in
T = Total Filter Height = 7.3 mm / 0.28 in
C = Filter Cell Height (Excluding Male Thread) = 4.9 mm / 0.19 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 = 45 mm / 1.77 in
Other Information
- Country of Manufacture: China
Antlia O-III and H-Beta Photo-Visual Filter - 2" Mounted