Optolong L-eXtreme 2" | PixelSkiesAstro
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  • Optolong L-eXtreme 2" | PixelSkiesAstro
  • Optolong L-eXtreme 2" | PixelSkiesAstro
  • Optolong L-eXtreme 2" | PixelSkiesAstro
  • Optolong L-eXtreme 2" | PixelSkiesAstro

Optolong L-eXtreme 2"

€329.00
Tax included

Optolong L-eXtreme filter 2" The L-eXtreme is a dual 7 nm narrowband filter isolating H-alpha and OIII for colour and monochrome cameras. With no passband between H-beta and OIII it admits less light pollution than the L-eNhance, for darker skies in images and stronger nebula contrast.

Manufacturer model: Optolong L-eXtreme 2" · Specifications checked against manufacturer data on 2026-11-03

Optolong L-eXtreme filter 2"

The L-eXtreme is a dual 7 nm narrowband filter isolating H-alpha and OIII for colour and monochrome cameras. With no passband between H-beta and OIII it admits less light pollution than the L-eNhance, for darker skies in images and stronger nebula contrast.

Specifications

Format 2" mounted
FWHM OIII 7 nm; H-alpha 7 nm
Substrate B270
Thickness 1.85 mm
Peak transmission >90%
Blocking range 300–1000 nm
Light-pollution line blocking >99%
Surface quality 60/40
Transmitted wavefront λ/4 RMS
Parallelism 30"

Coating

Multi-layer anti-reflection coating on a non-cemented substrate, applied by ion-assisted deposition for durability and a stable centre wavelength with temperature.

Manufacturer documentation

Optolong L-eXtreme 2"

Compatibility notes

Optolong L-eXtreme 2" mounted. Standard L-eXtreme, not L-eXtreme F2 (fast optics).

Additional specifications

Peak transmission>90%
66894

Data sheet

Blocking range
300–1000 nm
Format
2" mounted
FWHM
OIII 7 nm; H-alpha 7 nm
Light pollution line blocking
＞99%
Parallelism
30"
Substrate
B270
Surface quality
60/40
Thickness
1.85 mm
Transmitted wavefront
λ/4 RMS
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