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About this product
Model: antlia_hb_oiii_125
Antlia 1.25" H-Beta and OIII Visual and Photography Filter
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.
IMPORTANT: These filters are NOT designed for observing or photographing the Sun. DO NOT use these filters to observe or photograph the Sun. If you do it will result in permanent eye damage!
FEATURES
- 1.25" HB-OIII Filter
- 90% or greater transmission at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm).
- Higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula and extremely faint nebulae
- Suitable for observing and imaging use
- Use in light polluted areas and dark sites
- Large aperture recommended for visual use
- Edge blackened to eliminate internal reflections from stray light
- 2mm+/-0.05mm glass thickness
- Fine-optically polished on both sides
Transmission Chart
Purple Line - Represents the transmission curve of the filter.
The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)
The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)
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 |
| 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 |
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