The Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time.
The advanced multi-coatings on our 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. As Antlia ALP-T dual band 5nm filter looks golden yellow to the naked eye, we also call it the Golden filter.
Application and Performance:
Engineered specifically for use with DSLR, CMOS, and CCD color cameras
Suppression of optical density (OD)4.5 on unwanted visual 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
Good performance at focal ratios faster than F3.0 with contrast increasing as focal ratio increases
Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
Near IR (NIR) is blocked up to 1100nm
When we design filters for astronomy imaging systems, we look at how they will work together with optical systems, carefully designing the blocking and bandpass parameters to achieve an optimum result. The out of band blocking rate is a very important performance index since it is designed to sharply attenuate off unwanted band wavelengths.
Each filter is individually tested and scanned to ensure that the quality meets the high performance parameters. The end result is a filter that achieves excellent signal-to-noise but with a higher production cost. We believe the price to performance ratio compares more favorably than similar premium filters in the market.
Images
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: Betelgeuse(Magnitude：0.5)
- 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)
Not Recommended
Solar imaging
Night visual observation
Not Permitted
DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.
Serious eye damage will result if you fail to observe the warning.
Specifications
|
Hydrogen-alpha |
Oxygen III |
|
|
FWHM |
5nm |
5nm |
|
CWL (Central Wavelength) |
656.3nm |
500.7nm |
|
Peak Transmission |
90% |
82% |
|
Blocking |
≥OD4.5 @ 300-1100nm |
|
|
Filter Thickness |
2mm+/-0.05mm |
|
2'' (M48*0.75)
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading