Antlia SII 2.5nm 2" | PixelSkiesAstro
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  • Antlia SII 2.5nm 2" | PixelSkiesAstro
  • Antlia SII 2.5nm 2" | PixelSkiesAstro
  • Antlia SII 2.5nm 2" | PixelSkiesAstro

Antlia SII 2.5nm 2"

€675.00
Tax included

Antlia SII 2.5 nm Ultra Narrowband — 2" mounted Antlia's 2.5 nm Ultra series is its narrowest narrowband line. This SII filter isolates the 671.6 / 673.1 nm sulphur doublet, cleanly separated from H-alpha, to complete an SHO set with maximum contrast.

Manufacturer model: Antlia SII 2.5nm Ultra, 2-inch mounted · Specifications checked against manufacturer data on 2026-11-03

Antlia SII 2.5 nm Ultra Narrowband — 2" mounted

Antlia's 2.5 nm Ultra series is its narrowest narrowband line. This SII filter isolates the 671.6 / 673.1 nm sulphur doublet, cleanly separated from H-alpha, to complete an SHO set with maximum contrast.

Precision construction

The filter is made on 2 mm quartz-glass substrate, held to ±0.05 mm, and blocks out-of-band light to OD5. Antlia recommends it for optics at f/3.5 and slower.

Specifications

Lines SII, 671.6 nm and 673.1 nm
Bandwidth (FWHM) 2.5 nm (+0.3 / −0.1 nm)
Peak transmission At least 95%
Blocking OD5 minimum
Substrate Quartz glass, 2 mm ±0.05 mm
Recommended focal ratio f/3.5 and slower
Format 2-inch mounted

Manufacturer documentation

Antlia 2.5 nm Ultra narrowband filters

Compatibility notes

2.5 nm Ultra series. f/3.5 and slower.

Additional specifications

Peak transmission min (%)95
86310

Data sheet

Blocking
OD5 min
Format
2-inch mounted
FWHM (nm)
2.5 (+0.3/-0.1)
Lines (nm)
671.6; 673.1
Recommended focal ratio
f/3.5 and slower
Substrate
Quartz glass
Thickness (mm)
2 ±0.05
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