Home » Optolong L-Ultimate 2" Dual Narrowband Filter
Filtro Optolong L-Ultimate 2" per astrofotografia, ideale per telescopi in aree urbane grazie alla riduzione dell'inquinamento luminoso.
Filtro Optolong L-Ultimate 2" per astrofotografia, ideale per aree urbane con inquinamento luminoso, rivoluzionario per astrofili.
Grafico della trasmissione del filtro Optolong L-Ultimate 2" per l'astrofotografia, evidenziando le lunghezze d'onda chiave.
Filtro Optolong L-Ultimate 2" per astrofotografia, ideale per telescopi in aree urbane grazie alla riduzione dell'inquinamento luminoso.
Filtro Optolong L-Ultimate 2" per astrofotografia, ideale per aree urbane con inquinamento luminoso, rivoluzionario per astrofili.
Grafico della trasmissione del filtro Optolong L-Ultimate 2" per l'astrofotografia, evidenziando le lunghezze d'onda chiave.
Optolong

Optolong L-Ultimate 2" Dual Narrowband Filter

In stock - 1 items available
Product Code: OPL-ULTIMATE-2
€369,00 EUR incl. VAT
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Optolong L-Ultimate 2” – 3nm Dual Narrowband Filter for Astrophotography

The Optolong L-Ultimate 2” is a 3nm dual narrowband filter, the evolution of the well-known L-eXtreme. It precisely isolates the emission lines H-Alpha (656nm) and OIII (500nm) with peak transmission up to 93% and maximum light pollution suppression.

The 3nm bandwidth makes the L-Ultimate ideal for astrophotographers in urban and suburban areas using color CMOS cameras – enabling sessions even under full moon and Bortle 7–9 skies without a complex mono setup.

Key Advantages

  • 3nm bandwidth: maximum suppression of artificial light sources
  • Peak transmission up to 93%
  • Works under full moon and heavily polluted skies
  • One-filter solution for color CMOS cameras

Technical Specifications

Filter typeDual Narrowband (H-Alpha + OIII)
Bandwidth3nm
Peak transmissionUp to 93%
Format2” (50.8mm)
SubstrateSchott glass
Thickness2.0mm
Surface quality60/40 (MIL-O-13830)
Parallelism<30"
Flatness1/4λ
Recommended cameraColor CMOS

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