Antlia H-alpha 3 nm Pro 2" narrowband filter

The Antlia H-alpha 3 nm Pro 2" astrophotographic filter is designed specifically for capturing emission nebulae by transmitting red light with a wavelength of 656.3 nm emitted by ionized hydrogen atoms. This filter is highly effective in registering the important Hα spectral line in astrophotography.

One of the key advantages of the Antlia H-alpha 3 nm Pro 2" filter is its extremely narrow half-bandwidth of only 3 nm. This feature allows it to eliminate the unwanted components from sodium and mercury lamps while maintaining high transmittance for the Hα spectral line, which is crucial for astrophotography purposes.

It is important to note that the Hα filter is not recommended for visual observations. Its primary function is to enhance the registration of emission nebulae when used in conjunction with appropriate astrophotography equipment.

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

Bandpass filter manufactured on a high-quality Schott substrate, ensuring maximum transmission for radiation at a wavelength of 656.3 nm.

Compatible with astrographs that have a light intensity of up to f/3, such as RASA or Hyperstar systems.

Exceptionally narrow half-width of the transmitted band (FWHM = 3 nm).

Equivalent optical density (OD5) guarantees efficient removal of light pollution at a level of 99.999%.

Technical Parameters:

• 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

Set Components:

• Antlia H-alpha 3 nm Pro 2" filter

Guarantee:

The Antlia H-alpha 3 nm Pro 2" filter comes with a 3-year manufacturer's warranty, which covers delamination of the filter and substrate.