Antlia H-alpha 4.5 nm EDGE Filter 2 inch Mounted

Antlia H-alpha 4.5 nm EDGE Filter 2 inch Mounted

Description

The Antlia H-alpha 4.5 nm EDGE filter is engineered for imaging deep-sky H-alpha emission nebulae at the 656.3 nm line. Its optimized spectral profile (4.5 nm FWHM) and OD5 out-of-band blocking deliver more than 90 % peak transmission and outstanding results even on fast optical systems down to f/3.
A single non-glued substrate eliminates internal reflections and halos around bright stars. All edges are blackened to suppress stray light, ensuring superior optical uniformity.
The Antlia EDGE filter maintains high transmittance and contrast under both dark skies and light-polluted environments. It is ideal for capturing emission nebulae, planetary nebulae, Wolf-Rayet objects, and supernova remnants.
This filter is designed exclusively for astrophotography. It must not be used for solar or visual observation.

Technical Specifications

• Manufacturer: Antlia

• Product: H-alpha 4.5 nm EDGE Filter 2 inch mounted

• Type: narrowband H-alpha filter

• Central wavelength (CWL): 656.3 nm

• Full width at half maximum (FWHM): 4.5 nm

• Peak transmission: > 90 %

• Out-of-band blocking: OD5 (300–1000 nm)

• Optical substrate: single, non-glued

• Filter thickness: 2 mm ± 0.05 mm

• Surface quality: 60/40 (MIL-O-13830)

• Transmitted wavefront: λ/4 or better

• Parallelism: < 30 arcsec

• Filter mount: 2 inch (M48 x 0.75)

• Clear aperture: 48 mm

• Weight: approx. 0.01 kg

• Application: astrophotography of H-alpha objects

• Not recommended: solar imaging, visual observation