Antlia H-Alpha 3 nm Pro 31 mm Unmounted Narrowband Filter

Antlia H-Alpha 3 nm Pro 31 mm Unmounted Narrowband Astrophotography Filter

Discover the Antlia H-Alpha 3 nm Pro 31 mm Filter, a premium astrophotographic tool expertly crafted for capturing the ethereal beauty of emission nebulae. This specialized filter excels in transmitting red light at a precise wavelength of 656.3 nm, emitted by ionized hydrogen atoms, making it an essential component for astrophotographers seeking to capture the Hα spectral line.

Exceptional Performance

What makes the Antlia H-alpha 3 nm filter stand out is its remarkably narrow half-bandwidth of just 3 nm. This feature is critical in filtering out unwanted light from sodium and mercury lamps, while ensuring high transmission efficiency for the Hα spectral line, a vital aspect in astrophotography.

Note: This filter is specifically designed for astrophotography and is not recommended for visual observations.

Key Features

• Bandpass Filter: Crafted on a high-quality Schott substrate, it maximizes transmission for radiation at 656.3 nm.
• Compatibility: Ideal for use with astrographs with light intensity up to f/3, such as RASA or Hyperstar systems.
• Extremely Narrow Half-Bandwidth: Transmitted band features an FWHM of just 3 nm.
• Optical Density and Light Pollution Reduction: Offers exceptional light pollution reduction with an efficiency of 99.999% and optical density equivalent to OD5.

Technical Specifications

• Filter Type: Bandpass Filter
• Filter Diameter: 31 mm
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: Hα (656.3 nm)
• Peak Permeability Location (CWL): 656.3 nm
• Maximum Transmission: > 88%
• Blocked Bands: Mercury Lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), Sodium Lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm)
• Light Pollution Blocking Efficiency: > 99.999%
• Equivalent Optical Density for Blocked Lines: OD5 (300 - 1000 nm)
• Surface Quality Index (MIL-O-13830 standard): 60/40
• Parallelism: 30 arcseconds
• Execution Accuracy (RMS): λ / 4

Included in the Set

Your purchase includes the Antlia H-alpha 3 nm Pro 31 mm filter, the central element of this astrophotography set.

Warranty

Enjoy peace of mind with a 3-year warranty from the manufacturer, covering any delamination issues with the filter or its substrate.