Antlia ALP-T Dual Band 5nm Ha&OIII Filter
The Antlia ALP-T dual band 5nm Ha&OIII filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on Antlia ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.
The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.
Application and Performance:
Engineered specifically for use with DSLR, CMOS, and CCD color cameras
Suppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise
Extremely steep bandpass edges minimize internal reflections
Ideal flat-top and moderate bandpass reducing spectrum down shifts
Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter
Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
Near IR (NIR) is blocked up to 1100nm
Technical Specifications:
| Hydrogen-alpha | Oxygen III |
FWHM | 5nm | 5nm |
CWL (Central Wavelength) | 656.3nm | 500.7nm |
Peak Transmission | 92% | 88% |
Blocking | ≥OD4.5 @ 300-1100nm |
Filter Thickness | 2mm+/-0.05mm |
Sizes and MAP Prices：
Size | Minimum Advertised Pricing (MAP) |
Mounted: 2’’ | US$380.00 for both standard and highspeed version US$690.00 for one set of Ha&OIII and SII&Hb dualband 5nm filter |
Unmounted: Dia36mm | US$298.00 (1 X B-4836 adapter is included) for both standard and highspeed versios |
Other sizes | Availability is to be confirmed |
It is advised to use with Antlia ALP-T Dual Band 5nm SII&Hb filter.
Spectrum Curve:
Filter Ring:
2’’ (M48*0.75)
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading
Not Recommended:
Solar imaging
Night visual observation
Not Permitted:
DO NOT LOOK AT THE SUN WITH THIS FILTER
Serious eye damage will result if you fail to observe the warning.
Additional independent tests and reviews are available here, please credit the photographer's names if you use their images on your website.
Target: IC434 – Horse Head and Flame Nebulae
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera : IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 24
Bortle scale 5
Copyright: Hyunsu Lee(South Korea)
Target: NGC2244 – Rosette Nebula
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 30
Bortle scale 5
Copyright: Hyunsu Lee(South Korea)
Target: Western Veil nebula
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 7
Bortle scale 5
Copyright: Hyunsu Lee(South Korea)
Target: IC63 - The Phantom of Cassiopeia
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera : IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
- Exposure info: 300s X 32
Bortle scale 5
Copyright: Hyunsu Lee(South Korea)
Target: Aldebaran(Magnitude：0.85)
- Telescope: Skywatcher 130mm F5 w/MPCC
- Mount: Losmandy G11
- Camera: IMX571 26000KPA
- Filter: Antlia ALP-T Dual Band 5nm Filter 2’’
Copyright: Hyunsu Lee(South Korea)
