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Antlia SII 3 nm Pro Narrowband — 36 mm unmounted
Antlia's Pro series 3 nm SII filter isolates the sulphur doublet (671.6 / 673.1 nm), separating it cleanly from H-alpha, with OD5 blocking from 300 to 1000 nm for high-contrast SHO imaging.
Specifications
Lines
SII doublet, 671.6 / 673.1 nm
Bandwidth (FWHM)
3 nm
Peak transmission
Over 88%
Blocking
Over OD5, 300–1000 nm
Thickness
2 mm ±0.05 mm
Format
36 mm diameter, unmounted
Manufacturer documentation
Antlia SII 3nm Pro 36 mm
Reference
88245
Data sheet
Blocking
＞OD5, 300–1000 nm
Format
36 mm unmounted
FWHM (nm)
3
Lines (nm)
671.6; 673.1
Peak transmission (%)
＞88
Thickness (mm)
2 ±0.05
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Antlia SII 3 nm Pro Narrowband — 36 mm unmounted Antlia's Pro series 3 nm SII filter isolates the sulphur doublet (671.6 / 673.1 nm), separating it cleanly from H-alpha, with OD5 blocking from 300 to 1000 nm for high-contrast SHO imaging.
Manufacturer model: Antlia SII 3nm Pro, 36 mm unmounted · Specifications checked against manufacturer data on 2026-11-03
