Antlia H-alpha 2.5nm 2" | PixelSkiesAstro
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  • Antlia H-alpha 2.5nm 2" | PixelSkiesAstro
  • Antlia H-alpha 2.5nm 2" | PixelSkiesAstro
  • Antlia H-alpha 2.5nm 2" | PixelSkiesAstro

Antlia H-alpha 2.5nm 2"

€ 675,00
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Antlia H-alpha 2.5 nm Ultra Narrowband — 2" mounted Antlia's 2.5 nm Ultra series is its narrowest narrowband line. This H-alpha filter isolates the 656.3 nm hydrogen line for maximum contrast and tight stars, even under heavy light pollution or a bright Moon.

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

Antlia H-alpha 2.5 nm Ultra Narrowband — 2" mounted

Antlia's 2.5 nm Ultra series is its narrowest narrowband line. This H-alpha filter isolates the 656.3 nm hydrogen line for maximum contrast and tight stars, even under heavy light pollution or a bright Moon.

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

Line H-alpha, 656.3 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. Cell dimensions not published.

Additional specifications

Peak transmission min (%)95
86229

Datasheet

Blokkering
OD5 min
Formaat
2-inch mounted
FWHM (nm)
2.5 (+0.3/-0.1)
Lijn (nm)
656.3
Aanbevolen openingsverhouding
f/3.5 and slower
Substraat
Quartz glass
Dikte (mm)
2 ±0.05
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