Antlia SII 4.5 nm EDGE Filter 2 inch Mounted
279.00
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Antlia SII 4.5 nm EDGE Filter 2 inch Mounted
The Antlia SII 4.5 nm EDGE 2 inch mounted filter provides over 90 % transmission at 672.4 nm. Designed to capture faint sulfur II emission nebula structures, it ensures excellent contrast and precision for narrowband astrophotography.
Antlia SII 4.5 nm EDGE Filter 2 inch Mounted
Description
The Antlia SII 4.5 nm EDGE filter is a narrowband imaging filter for deep-sky astrophotography of nebulae emitting in the sulfur II (SII) line at 672.4 nm. With a 4.5 nm FWHM bandpass and OD5 out-of-band blocking, it achieves more than 90 % transmission across the central wavelength.
The filter design, derived from the Antlia 3 nm Pro series, delivers superior signal-to-noise ratio and outstanding image contrast. Its steep spectral profile minimizes halos around bright stars, while the single non-glued substrate eliminates internal reflections.
The filter’s edge is blackened to prevent stray light, providing stable spectral performance even with fast optical systems down to f/3. Antlia EDGE filters offer excellent optical reliability and are ideal for long-exposure imaging under light-polluted or moonlit conditions.
This filter is intended solely for astrophotography of SII emission nebulae and must not be used for solar or visual observation.
Technical Specifications
Manufacturer: Antlia
Product: SII 4.5 nm EDGE Filter 2 inch mounted
Type: narrowband SII filter
Central wavelength (CWL): 672.4 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
Net weight: approx. 0.01 kg
Application: astrophotography of SII emission objects
Not recommended: solar imaging, visual observation
Antlia SII 4.5 nm EDGE 2"
Antlia SII 4.5 nm EDGE Filter 2 inch Mounted
The Antlia SII 4.5 nm EDGE 2 inch mounted filter provides over 90 % transmission at 672.4 nm. Designed to capture faint sulfur II emission nebula structures, it ensures excellent contrast and precision for narrowband astrophotography.