Antlia H-Alpha 50 mm 4,5 nm EDGE

The Antlia H-Alpha 50 mm 4.5 nm EDGE is a top-of-the-line astrophotography filter designed for professionals. It features a narrow transmission window with a half-width transmission of 4.5 nm, specifically optimized for capturing the 656.3 nm wavelength of red light emitted by ionized hydrogen atoms. This particular wavelength is crucial when photographing emission nebulae.

One of the key advantages of this filter is its ability to effectively eliminate unwanted light from sodium and mercury lamps while maintaining high transmission for the Hα spectral line. This makes it an indispensable tool for astrophotographers. The filter is constructed on a high-quality glass substrate, minimizing the risk of internal light reflections that could degrade image quality.

The Antlia H-Alpha 50 mm 4.5 nm EDGE filter exhibits a steep slope in its permeability window, unlike standard broadband filters. This means that it maintains consistent transmittance without a significant decrease resulting from the shift of the maximum permeability peak (CWL). Consequently, filters from the Antlia 4.5 nm EDGE family perform exceptionally well with telescopes of varying light intensities. The manufacturer's data indicates that these filters can be effectively used in optical systems with a maximum light power of f/3.

It is important to note that the Ha filter is not suitable for visual or solar observations.

Key Features of the Antlia H-Alpha 50mm 4.5nm EDGE Filter:

Bandpass filter designed on a high-quality optical substrate with maximum transmission for 656.3 nm radiation.

Compatible with astrographs featuring light intensities up to f/3, ensuring minimal signal loss.

Half bandwidth of transmission (FWHM) measures 4.5 nm.

Optical density equivalent of OD5, guaranteeing efficient removal of light pollution.

Technical Specifications:

• Filter type: Bandpass filter
• Filter diameter: 50 mm
• Filter thickness: 3 ± 0.05 mm
• Filter shape: Round
• Pass bands: Hα (656.3 nm)
• Location of transmittance peak (CWL): 656.3 nm
• Half bandwidth (FWHM): 4.5 nm
• Maximum transmission: >90% ± 1 nm from the maximum transmission peak
• Blocked light pollution 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)
• Optical density equivalent for blocked lines: OD5 (300 - 1000 nm)
• Surface quality index (according to MIL-O-13830): 60/40
• Parallelism: 30"
• Manufacturing accuracy (RMS): λ/4

Included in the Set:

• Antlia H-Alpha 50mm 4.5nm EDGE filter

Guarantee:

The manufacturer provides a 3-year warranty for any delamination issues of the filter and substrate, ensuring peace of mind for customers.