Antlia H-alpha 3 nm Pro 2" Astrophotographic Narrowband Filter

The Antlia H-alpha 3 nm Pro 2" Astrophotographic Narrowband Filter is expertly crafted for astrophotographers aiming to capture the stunning details of emission nebulae. This filter transmits the specific red light at a wavelength of 656.3 nm, a key emission line produced by ionized hydrogen atoms, making it essential for high-quality astrophotography.

Why Choose the Antlia H-alpha 3 nm Pro 2" Filter?

• Ultra-Narrow Bandwidth: With a remarkably narrow half-bandwidth of just 3 nm, this filter effectively blocks out unwanted light from sodium and mercury lamps, all while maintaining excellent transmission of the Hα spectral line.
• Astrophotography Focused: It is specifically designed for astrophotography, significantly enhancing the contrast and detail of emission nebulae in your images.
• High-Quality Construction: Built on a premium Schott substrate, it ensures maximum transmission for radiation at the critical 656.3 nm wavelength.

Note: This filter is not suitable for visual observations; it is intended solely for use with astrophotography equipment.

Key Features of the Antlia H-alpha 3 nm Pro 2" Filter:

• Compatibility: Works seamlessly with astrographs of up to f/3, including RASA and Hyperstar systems.
• Light Pollution Reduction: Achieves a light pollution blocking efficiency of over 99.999%, thanks to its optical density (OD5).
• Exceptional Optical Performance: Offers a surface quality index of 60/40 and execution accuracy of λ/4 (RMS).

Technical Specifications:

• Filter Type: Bandpass filter
• Filter Diameter: 2"
• Filter Thickness: 2 ± 0.05 mm
• Filter Shape: Round
• Transmitted Bands: Hα (656.3 nm)
• Location of Maximum Peak Permeability (CWL): 656.3 nm
• Half Bandwidth (FWHM): 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 (according to MIL-O-13830 standard): 60/40
• Parallelism: 30"
• Execution Accuracy (RMS): λ/4

What's in the Box?

• Antlia H-alpha 3 nm Pro 2" Filter

Warranty Information:

The Antlia H-alpha 3 nm Pro 2" filter is backed by a 3-year manufacturer's warranty, covering any delamination of the filter and substrate, ensuring peace of mind with your purchase.