Optolong L-Extreme 1,25" filtr dual band (Ha + OIII)

Photographing luminous emission nebulae under the challenging conditions of high light pollution has never been easier, thanks to the Optolong L-Extreme 1.25" dual-band filter. This remarkable tool is tailored for use with digital SLRs and monochrome cameras, making it a must-have for astrophotography enthusiasts.

This innovative filter is designed to transmit over 90% of the light from the spectral lines emitted by ionized hydrogen (Hα) and oxygen (OIII) atoms. With a slim half-width of just 7 nm, it effectively separates the OIII line from Hβ. Its narrow bandwidth, in conjunction with its ability to efficiently block out spectral lines typically associated with sodium and mercury lamps, ensures the capture of crisp and high-contrast images, even in proximity to light-polluted urban areas. Furthermore, the narrow bandwidth significantly enhances contrast during moonlit nights and when photographing emission nebulae near bright stars.

To further enhance its optical performance, the Optolong L-Extreme filter is equipped with a full multi-layer anti-reflection coating, applied using advanced ion implantation techniques. This not only ensures optimal optical properties but also renders the filter highly durable and resistant to scratches.

Key Features of the Optolong L-Extreme 1.25" Filter:

Dual-band filter designed for high transmission of Hα and OIII lines.

Exceptional light pollution blocking efficiency exceeding 99%.

Robust multi-layer anti-reflective coating for scratch resistance.

Technical Specifications:

Filter Type: Dual-band filter

Filter Diameter: 1.25"

Half Bandwidth: 7 nm

Pass Bands: Hα, OIII

Maximum Transmission: Over 90%

Blocking Range: 300 - 1000 nm

Light Pollution Blocking Efficiency: >99%

Filter Material: Schott B 270 glass

Coating Type: Full multi-layer coating (FMC)

Filter Thickness: 1.85 mm

Surface Quality Index: 60/40

Parallelism: 30"

RMS Execution Accuracy: λ / 4

Frame Material: Aluminum

Kit Components:

Optolong L-Extreme 1.25" Filter

Warranty:

Enjoy peace of mind with a 24-month warranty.

In summary, the Optolong L-Extreme 1.25" Dual-Band Filter is your gateway to capturing breathtaking images of emission nebulae, even in light-polluted areas. With its advanced technology and superior optical characteristics, this filter is an indispensable tool for astrophotographers seeking to reveal the beauty of the night sky.