Antlia H-alpha 3 nm Pro 36 mm Unmounted Narrowband Filter for Astrophotography

Discover the ultimate tool for professional astrophotography with the Antlia H-alpha 3 nm Pro 36 mm Unmounted Narrowband Filter. Expertly designed to capture the elusive red light emitted by ionized hydrogen atoms at a precise wavelength of 656.3 nm, this filter is an essential accessory for photographing emission nebulae.

Key Features

• Ultra-Narrow Bandwidth: With a Full Width at Half Maximum (FWHM) of just 3 nm, this filter ensures precision by capturing only the desired wavelengths, effectively eliminating interference from sodium and mercury lamps.
• High Transmission Efficiency: Maintains exceptional transmission for the crucial Hα spectral line, making it invaluable for capturing detailed astrophotographic images.
• Compatibility: Seamlessly integrates with astrographs featuring light intensity up to f/3, such as RASA or Hyperstar, offering flexibility in various astrophotography setups.
• Premium Construction: Crafted from high-quality Schott substrate to ensure maximum performance and durability.
• High Blocking Efficiency: Achieves an optical density of OD5, offering over 99.999% efficiency in blocking unwanted light pollution from mercury and sodium lamps.

Technical Specifications

• Filter Type: Bandpass Filter
• Filter Diameter: 36 mm
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: Hα (656.3 nm)
• Center Wavelength (CWL): 656.3 nm
• FWHM (Half Bandwidth): 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 (as per MIL-O-13830 standard): 60/40
• Parallelism: 30 arc seconds
• Execution Accuracy (RMS): λ / 4

Included Components

• Antlia H-alpha 3 nm Pro 36 mm Filter

Warranty

The Antlia H-alpha filter comes with a 3-year warranty that covers delamination of the filter and substrate, ensuring reliable and long-lasting performance for dedicated astrophotographers.

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