Antlia H-alpha 2.5nm 2" | PixelSkiesAstro
search
  • 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 €
TTC

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

Fiche technique

Blocage
OD5 min
Format
2-inch mounted
FWHM (nm)
2.5 (+0.3/-0.1)
Raie (nm)
656.3
Rapport F/D recommandé
f/3.5 and slower
Substrat
Quartz glass
Épaisseur (mm)
2 ±0.05
Vous utilisez ce produit ? Partagez votre expérience avec d'autres astronomes.
Commentaires (0)
Aucun avis n'a été publié pour le moment.

Déjà vus

16 autres produits dans la même catégorie :

Chroma LRGB Set 36mm | PixelSkiesAstro
Chroma

Chroma LRGB Set 36mm

Chroma LRGB Filter Set 36 mm (27101) — unmounted Chroma's flagship LRGB set (27101) provides coordinated...
1 290,00 €
Délai de livraison à confirmer
Voir le matériel →
Optolong SII 3nm 2" | PixelSkiesAstro
Optolong

Optolong SII 3nm 2"

Optolong SII 3nm filter 2" Optolong's SII 3 nm narrowband filter isolates the ionised-sulphur emission line...
389,00 €
Délai de livraison à confirmer
Voir le matériel →
Optolong LRGB 1.25" | PixelSkiesAstro
Optolong

Optolong LRGB 1.25"

Optolong LRGB filter 1.25" Optolong's LRGB set splits the spectrum into luminance, red, green and blue for...
229,00 €
Délai de livraison à confirmer
Voir le matériel →