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Astronomik L-RGB Filterset 1.25" (E28.5) Type 2c, 4 Filters


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Astronomik L-RGB Filterset 1.25" (E28.5) Type 2c, 4 Filters
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Astronomik L-RGB Filterset 1.25" (E28.5) Type 2c, 4 Filters

The transmission properties of the Astronomik L-RGB Typ 2c filters are optimized for CCD astrophotography. This set allows to take images in the correct colours for all types of celestial imaging targets. Where other brands make strange compromises, Astronomik have worked to provide their users with the best colour reproduction possible. Both stars and other objects that emit only in certain spectral lines, are reproduced in their true colors and result in CMOS/CCD images with perfect colour reproduction. This feature is the main difference between Astronomik filters and those of other manufacturers.

The following considerations have been most considered important for the design of this particular 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 consistancy of colour, they calculated their filterset specifically for the sRGB color space, (the 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. Astronomik have solved these specific 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".

more information about the photographic Astronomik filters

How to read the chart

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
Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past

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