Antlia H-Alpha 36 mm 4,5 nm EDGE

The Antlia H-Alpha 36mm 4.5nm EDGE filter is a cutting-edge tool for professional astrophotographers. With its remarkably narrow half-width transmission window (FWHM) of just 4.5 nanometers, this filter is engineered to capture the elusive red light at 656.3 nanometers emitted by ionized hydrogen atoms. This feature is particularly essential for photographers aiming to capture the beauty of emission nebulae in the night sky.

One of the standout features of this filter is its remarkable ability to effectively eliminate unwanted light components, such as those emanating from sodium and mercury lamps. Simultaneously, it boasts a high level of transmission for the Hα spectral line, which is of paramount importance in the field of astrophotography. Crafted on a high-quality glass substrate, this filter is designed to minimize the risk of internal light reflections, ensuring the utmost clarity in your astrophotographs.

What sets the Antlia H-Alpha 36mm 4.5nm EDGE filter apart is its steep slope of the permeability window. Unlike conventional broadband filters, it maintains consistent transmittance even when there is a shift in the maximum permeability peak (CWL). This means that filters from the Antlia 4.5nm EDGE family are highly versatile and suitable for use with telescopes that have a wide range of light intensities. According to the manufacturer's specifications, these filters have been tested and proven to work seamlessly with optical systems boasting a maximum light power of f/3.

Please note that the Ha filter is not recommended for visual or solar observations due to its specialized purpose in astrophotography.

Key Highlights of the Antlia H-Alpha 36mm 4.5nm EDGE Filter:

• A bandpass filter crafted on a high-quality optical substrate, optimized for maximum transmission of 656.3nm wavelength radiation.
• Compatibility with astrographs featuring light intensities up to f/3, ensuring minimal signal loss.
• An ultra-narrow half bandwidth of transmission (FWHM) at just 4.5nm.
• Optical density equivalent to OD5, guaranteeing efficient light pollution removal.

Technical Specifications:

Filter Type: Bandpass Filter

Filter Diameter: 36mm

Filter Thickness: 2 ± 0.05mm

Filter Shape: Round

Pass Bands: Hα (656.3nm)

Location of Peak Transmittance (CWL): 656.3nm

Half Bandwidth (FWHM): 4.5nm

Maximum Transmission: >90% ± 1nm from the maximum transmission peak

Blocked Light Pollution Bands: Mercury Lamps (435.8nm, 546.1nm, 577nm, 578.1nm), Sodium Lamps (598nm, 589.6nm, 615.4nm, 616.1nm)

Optical Density Equivalent for Blocked Lines: OD5 (300 - 1000nm)

Surface Quality Index (According to MIL-O-13830): 60/40

Parallelism: 30"

Manufacturing Accuracy (RMS): λ/4

What's Included:

• Antlia H-Alpha 36mm 4.5nm EDGE Filter

Rest easy with a 3-year manufacturer's warranty, covering delamination of the filter and substrate. Elevate your astrophotography game with the Antlia H-Alpha 36mm 4.5nm EDGE Filter, your gateway to capturing the cosmos in all its glory.