Astronomik LRGB Filter set 1,25" (E28,5) Type 2c - 2

Astronomik LRGB Filter set 1,25" (E28,5) Type 2c


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Astronomik LRGB Filter set 1,25" (E28, 5) Type 2c - ANK_LRGB-125

De filters van de Astronomik LRGB filterset zijn geoptimaliseerd voor CCD astrofotografie. Met deze filters kunnen kleur-echte foto's gemaakt worden van alle soorten objecten. Objecten die in een zeer breed bandbreedte licht uitzenden zoals sterren en sterrenstelsels, maar ook smalbandige objecten zoals planetaire nevels worden afgebeeld in hun ware kleuren. Door het ontwerp van de filters worden kleuren gereproduceerd zoals deze door het menselijk oog worden geregistreerd. Hierdoor tonen uw foto's de objecten zoals ze door het menselijk oog gezien zouden worden als het een stuk gevoeliger zou zijn.

Alle filters hebben dezelfde dikte en hierdoor hoeft niet voor elke kleur individueel scherp te worden gesteld. Scherpstellen kan het best gedaan worden door het doorzichte L filter (Luminance) . Deze zorgt ervoor dat storend IR licht wordt tegengehouden

Deze Astronomik kleuren filters werken met nagenoeg alle CCD sensors op de markt en geven een kleurbalans om van te watertanden.

Our filter set especially designed for astrophotography with CCD cameras. These filters provide a natural color reproduction of planets, stars, emission- and reflection nebulas.

We have re-desgined all of our photographic filters. Since the end of 2008 we are shipping our new "Halo-Free" filters.

The transmission properties of the L-RGB Typ 2c filters are optimized for CCD astrophotography. The set allows to take images in correct colour for all types of objects. Where other brands make strange compromises, we do the best colour reproduction possible. Both stars as well as objects that emit only in spectral lines, are reproduced in their true colors. You get CCD images with perfect colors, as if the objects where bright enough to be seen with photopic vision. This feature is the main difference between Astronomik filters an those of other manufacturers.

The following aspects have been most important for the design of our filterset:

  • simple image processing for the user
  • highest transmission (nearly 100%) for short exposure times
  • adjusted transmissions of the individual filters for optimal colour reproduction
  • the use of industry standards

Astronomik doesn«t stop thinking at the step of taking the picture. More important a tool should be given to the astrophotographers that offers a simple and elegant editing process. To maintain the colour, we calculated our filterset for the sRGB color space, that is used as an industry standard from most manufacturers of monitors, printers and imaging software. As a user you do not need to spend time to learn about colourimetry and colour spaces. We have solved the special problems of astrophotography for you.

Due to the high-precision machining of the carrier substrate, our filters are parfocal with wedge errors below all usual margins. In order not to be the bottleneck in a high-quality optical system Astronomik filters are of course diffraction limited. Issues concerning focal distances as well as the exact location of the images of each colour image are not a problem at all!

Main use

The L-RGB filter set divides the spectrum into its components red, green, blue and luminance. Thus colour separation can be achieved with pure b/w CCD sensors. The separation corresponds to the colour sensitivity of the human eye according to DIN 5032. By using the sRGB color space it is possible to maintain the color of the image throughout the entire image processing and output. With an Astronomik L-RGB filter set and your camera you create ideal raw material for imageprocessing in the sRGB color space.

Other uses

In combination with the Astronomik line filters your images will show interesting details of astronomical objects. For example, the red image can be enhanced by H-alpha or the green image by OIII.
For planetary observation and photography the color filters are gladly "misused".


  • Visual observation (dark skies) : Good, used as colour filter for planetary observations
  • Visual observation (urban skies) : Good, used as colour filter for planetary observations
  • Film photography: Unsuitable
  • CCD photography: Very good, excellent colour separation with RGB and L-RGB pics
  • DSLR photography (original) : Unsuitable
  • DSLR photography (astro modified) : Unsuitable
  • DSLR photography (MC modified) : Unsuitable
  • Webcam / Video (Planets) : Good, used as colour filter for imaging planets
  • Webcam / Video (Deep Sky) : Good, used as colour filter for imaging planets

Technical Data
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Astronomik filters are delivered in a high-quality, long lasting, filter box


Astronomik LRGB filterset 31,75mm (1¼ inch):

  • Rood, groen, blauw en luminance filetrs;
  • Filters met uitwendig schroefdraad van 31,75mm (1¼ inch);
  • Elk filter heeft dezelfde dikte en is hierdoor parfocaal (allemaal op het zelfde punt scherp);
  • Nagenoeg 100% transmissie voor elk filter;
  • Bestand tegen vochtigheid en krassen;
  • Zeer hoogwaardig optisch glas;
  • Plastic bewaar doos.
Filter Application
Filter Type
Filter size
1¼ inch (31.75mm)



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Astronomik LRGB Filter set 1,25" (E28,5) Type 2c

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