Askar 1,25 LRGB filter set all astro filters opinie

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Askar LRGB 1.25 "is a set of filters dedicated to cooperation with monochrome cameras equipped with CMOS and CCD sensors.

Each of the filters was made of a high-quality glass substrate with a thickness of 1.85 mm and is characterized by a very high transmittance, exceeding ± 90% in a given spectral range. Hand in hand with excellent efficiency is a very good ability to block light of wavelengths outside the filter window.

The separation of the maximum transmittance for the G and R filters was selected in such a way as to eliminate the signal coming from the spectral lines of sodium lamps, which constitute the main part of the light pollution, to the greatest possible extent.

To ensure compliance with the technical specification, each filter undergoes individual control in the manufacturer's laboratory.

The most important features of Askar LRGB 1.25 "filters

• a set of four filters designed for astrophotography with the use of monochrome CCD and CMOS cameras
• high transmittance in the pass band and high optical density for the remaining spectral range
• Parfocal with other astrophotographic filters

Technical specifications

• filter type: bandpass filter, LRGB
• application: monochrome CCD and CMOS cameras
• diameter of the filters: 1.25 "
• filter thickness: 1.85 ± 0.1 mm
• shape of filters: round
• RGB channels weights: 1: 1: 1
• maximum transmission for the L filter:> 95%
• maximum transmission range for the L filter: 400 - 695 nm
• equivalent optical density for the L: OD3 filter
• blocking range for the L filter: 300 - 385 nm / 720 - 1050 nm
• maximum transmission for the R filter:> 93%
• maximum transmission range for the R filter: 598 - 693 nm
• equivalent optical density for the R: OD3 filter
• blocking range for the R filter: 300 - 583 nm / 713 - 1100 nm
• maximum transmission for the G filter:> 93%
• maximum transmission range for the G filter: 500 - 580 nm
• equivalent optical density for the G: OD3 filter
• blocking range for the G filter: 300 - 380 nm / 595 - 1050 nm
• maximum transmission for filter B:> 90%
• maximum transmission range for the B filter: 395 - 500 nm
• equivalent optical density for filter B: OD3
• blocking range for filter B: 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: M28.5x0.6

Elements of the set

• Askar RGB R filter (red) 1.25 "
• Askar RGB G filter (green) 1.25 "
• Askar RGB B filter (blue) 1.25 "
• Askar L filter (luminance) 1.25 "

guarantee

24 months