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Antlia ALP-T Golden Dual Band Filter - 2-inch
The Antlia ALP-T Golden Dual Band Filter - 2" (5nm) is recommended for astrophotography in areas with light pollution, designed specifically for use with one-shot colour (OSC) CMOS cameras.
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Develop clean imagery and suppress light pollution.
Key Features
- Impressive signal-to-noise ratio with an optical density (OD) suppression of 4.5 on unwanted visual wavelengths (300-1100 nm)
- Maximises transmission of the Red H-Alpha (Ha) and Blue-Green OIII Main Nebula Emission Lines
- Performs well with focal ratios greater than f/3, with contrast increasing as focal ratio increases
- Ultra-thin filter cell
- IR/UV-Cut filter
The Antlia ALP-T Golden Dual Band Filter - 2" (5nm) features advanced multi-coatings to effectively isolate and maximise the transmission of the Red H-Alpha (Ha) and Blue-Green Oxygen III Nebula Emission Lines.
You'll also notice suppressed light pollution from artificial sodium vapour / mercury vapour lamps, as well as less natural light from atmospheric sky glow (neutral oxygen emission) and moonlight.
With each filter individually tested, the Antlia ALP-T Golden Dual-Band Filter - 2" (5nm) creates exceptional contrast for cleaner images, meaning that you'll spend less time in post-production isolating those faint details in your images.
EXERCISE CAUTION: The Antlia ALP-T Golden Dual Band Filter 2-inch (5nm) is not suitable for looking at the Sun. Serious eye damage may result.
Optics Central also offers an unmounted variant of the Antlia ALP-T: the Antlia ALP-T Golden Dual Band Filter - 36mm (5nm).
For telescopes with faster focal ratios (between f/3.6 and f/2.2), the Antlia Fast Golden Dual Band Filter - 2" or the Antlia Fast Golden Dual Band Filter - 36mm are more suitable.
Specifications
| Technical Specifications |
| FWHM | 5nm |
| Central Wavelength (Hydrogen-Alpha) | 656.3nm |
| Peak Transmission (Hydrogen-Alpha) | 90% |
| Central Wavelength (Oxygen III) | 500.7nm |
| Peak Transmission (Oxygen III) | 82% |
| Blocking | ≥ OD4.5 @ 300-1100nm |
| Filter Glass Thickness | 2mm +/- 0.05mm |
| Filter Ring |
| 2" M48*0.75 |
| Finish: Anodised Black |
| Filter Cell: Ultra-Thin (minimises vignetting by maximising possible clear aperture) |
| Laser Engraving |
Antlia: Experts in Astronomy Filters
Antlia Astronomy Filters are built by Deep-Sky Photography Enthusiasts for Enthusiasts all around the globe. Antlia prides itself on producing a series of exceptional quality, fully multicoated narrowband, dual-band, planetary and LRGB filters for astrophotography, designed for use with a range of monochrome and colour DSLR, CMOS and CCD cameras.
Product Code: ALP-T