Optolong LRGB + HSO 1,25" (SKU: OPL-LRGBNB-1)

The Optolong LRGB + HSO 1.25" is a comprehensive set of seven astronomical filters designed specifically for professional astrophotography.

Each filter in the LRGB palette boasts exceptional performance, with a transmission efficiency exceeding 95% in the maximum transmission band. By utilizing high-quality glass substrates and employing a full multilayer coating, these filters produce incredibly vivid and high-contrast images. Additionally, the G and R filter peaks have been strategically chosen to effectively suppress the signal from sodium lamp spectral lines, which are a major source of light pollution.

The HSO palette comprises narrowband filters that enable capturing stunning photographs of emission nebulae, including the renowned Pillars of Creation. The narrow half-width of the Hα, S II, and O III bands allows for astrophotography even under challenging conditions such as a full moon.

All filters included in this kit are protected by a durable and scratch-resistant full multilayer anti-glare coating, achieved through advanced ion implantation techniques. This ensures not only exceptional optical performance but also long-lasting durability.

Key Features of the Optolong LRGB + HSO 1.25" Filter Set:

Premium LRGB and HSO filters made of high-quality glass from the renowned Schott company.

Full multilayer coating to eliminate glare and protect against scratches.

Equal weights for the channels in the RGB palette.

Enhanced separation of passbands in the R and G filters, effectively blocking sodium lamp emission lines.

Technical Specifications:

• Filter Types: LRGB, HSO
• Filter Diameter: 1.25"
• Transmission for LRGB palette bandwidth: 95%
• Transmission beyond LRGB palette bandwidth: 0.1%
• Optical Density equivalent beyond LRGB palette bandwidth: OD3
• IR Cut-off in Luminance Channel: 700 - 1100 nm
• Hα Line Passband Midpoint: 656.3 nm
• Hα Line Half Bandwidth (FWHM): 7 nm
• Transmission for Hα Line Band: 85%
• S II Line Passband Midpoint: 672 nm
• S II Line Half Bandwidth (FWHM): 6.5 nm
• Transmission for S II Line Band: 80%
• O III Line Passband Midpoint: 500 nm
• O III Line Half Bandwidth (FWHM): 6.5 nm
• Transmission for O III Line Band: 80%
• Substrate: Schott optical glass
• Filter Thickness: 2 mm
• Surface Quality Index: 60/40
• Surface Finish: Polished
• Anti-Reflective Coating: Full multilayer coating (FMC)
• RMS Execution Accuracy: λ / 4
• Frame Material: Anodized aluminum
• Frame Color: Black

Set Components:

• Optolong UV/IR-Cut Filter 1.25"
• Optolong R-CCD 1.25" Filter
• Optolong G-CCD 1.25" Filter
• Optolong B-CCD 1.25" Filter
• Optolong Hα 1.25" Filter
• Optolong S II 1.25" Filter
• Optolong O III 1.25" Filter

Warranty:

This filter set is backed by a 24-month guarantee, ensuring peace of mind for your astrophotography endeavors.