Antlia H-Alpha 50mm 4.5nm EDGE Astrophotography Filter

Introducing the Antlia H-Alpha 50mm 4.5nm EDGE, a premium astrophotography filter crafted for professional astrophotographers. This advanced filter is engineered with a narrow transmission window of 4.5 nm, specifically tuned to capture the 656.3 nm wavelength, the red light emitted by ionized hydrogen atoms—essential for stunning images of emission nebulae.

Why Choose the Antlia H-Alpha 50mm 4.5nm EDGE Filter?

• **Exceptional Light Blocking:** Efficiently filters out unwanted light from sodium and mercury lamps, while ensuring high transmission for the Hα spectral line.
• **Superior Construction:** Built on a high-quality glass substrate to minimize internal reflections, enhancing image clarity.
• **Consistent Performance:** Features a steep slope in permeability, maintaining consistent transmittance across varying telescope light intensities up to f/3.

Note: This filter is not intended for visual or solar observations.

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