Askar 2" LRGB filter set

The Askar LRGB 2 filters are specifically designed to work with monochrome cameras equipped with CMOS and CCD sensors.

Each filter in the set is constructed using a high-quality glass substrate with a thickness of 1.85 mm. These filters boast an exceptional level of transmittance, surpassing ± 90% within the specified spectral range. Additionally, they possess excellent light-blocking capabilities for wavelengths outside the filter window.

The selection of the maximum transmittance separation for the G and R filters has been carefully made to effectively minimize the interference caused by spectral lines from sodium lamps, which are a significant source of light pollution.

To ensure adherence to the technical specifications, every individual filter undergoes thorough testing in the manufacturer's laboratory.

Key Features of Askar LRGB 2 Filters:

A comprehensive set of four filters specifically designed for astrophotography with monochrome CCD and CMOS cameras.

High transmittance within the pass band and optimal optical density across the remaining spectral range.

Parfocal compatibility with other astrophotographic filters.

Technical Specifications:

• Filter Type: Bandpass filter, LRGB.
• Application: Monochrome CCD and CMOS cameras.
• Filter Diameter: 2".
• Filter Thickness: 1.85 ± 0.1 mm.
• Filter Shape: Round.
• RGB Channels Weights: 1:1:1.
• Maximum Transmission for L Filter: > 95%.
• Maximum Transmission Range for L Filter: 400 - 695 nm.
• Equivalent Optical Density for L Filter: OD3.
• Blocking Range for L Filter: 300 - 385 nm / 720 - 1050 nm.
• Maximum Transmission for R Filter: > 93%.
• Maximum Transmission Range for R Filter: 598 - 693 nm.
• Equivalent Optical Density for R Filter: OD3.
• Blocking Range for R Filter: 300 - 583 nm / 713 - 1100 nm.
• Maximum Transmission for G Filter: > 93%.
• Maximum Transmission Range for G Filter: 500 - 580 nm.
• Equivalent Optical Density for G Filter: OD3.
• Blocking Range for G Filter: 300 - 380 nm / 595 - 1050 nm.
• Maximum Transmission for B Filter: > 90%.
• Maximum Transmission Range for B Filter: 395 - 500 nm.
• Equivalent Optical Density for B Filter: OD3.
• Blocking Range for B Filter: 300 - 380 nm / 520 - 1050 nm.
• Surface Quality Index: 60/40.
• Parallelism: 30".
• Light Incidence Angle: 0 - 8°.
• Frame Finish: Matte black, anodized.
• Holder Thread: M48x0.75.

Elements Included in the Set:

• Askar RGB R Filter (Red) 2".
• Askar RGB G Filter (Green) 2".
• Askar RGB B Filter (Blue) 2".
• Askar L Filter (Luminance) 2".

Guarantee:

A 24-month guarantee is provided for the Askar LRGB 2 filters.