Manufacturer: Astronomik Filter
Product number: 8H00GT

EUR 109,00


incl. 19 % VAT (DE)  
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A filter especially designed for astrophotography with CCD and CMOS cameras. These filters provide a natural color reproduction of planets, stars, emission and reflection nebulas.

The transmission properties of the L-RGB Typ 2c filters are optimized for CCD and CMOS astrophotography. The set allows to take images in correct colour for all types of objects. Where other brands make strange compromises, Astronomik does 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 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 LRGB filters an those of other manufacturers.

The following aspects have been most important for the design of Astronomik LRGB filters:
simple image processing for the user
highest transmission (nearly 100%) for short exposure times
adjusted transmissions of the individual filters for optimal colour reproduction
integrated IR blocking up to approx. 1150 nm
can be combined to form a complete LRGB set
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, they calculated their 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. Astronomik have solved the special problems of astrophotography for you.

Due to the high-precision machining of the carrier substrate, Astronomik 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 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 [O III].
For planetary observation and photography, the color filters are gladly "misused".


Suitability:
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 and CMOS 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:
The filters are suitable for use with all focal ratios.
The transmission is typically 97-99%.
All filters are IR-UV blocked and therefore suitable for CCD and CMOS photography.
Homofocal with all other Astronomik filters
Filter thickness: 1 mm
Not sensitive to moisture, not aging, scratch resistant
Fine optical polished substrate material
The filter is supplied in durable packaging.


Note on the protective ring:

Astronomik delivers the round filters from 31 mm diameter with a protective ring at the edge. The corresponding declarations of the manufacturer are available for download as PDF.

Filter transmission curve:



The horizontal axis is the wavelength in nanometers (nm). 400 nm is deep blue, at 520 nm the human eye senses green and at 600 nm red. At 656 nm is the famous "H-Alpha" emission line of hydrogen.
The transmission in % is plotted on the vertical axis.
The red line shows the transmission of the filter.
Visual filters: The grey line in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510 nm and drops to longer and shorter wavelengths. You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity at 656 nm is 0% at night!
Photographic filters: The grey line in the background shows the sensitivity of a typical astro camera sensor.
The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), which are used in nearly all streetlights.
The most important emission lines from nebulas are shown in green. The most important lines are from ionized hydrogen (H-alpha and H-beta) and double ionized oyxgen ([O III]). The square brackets indicate that these lines are forbidden.

Type:Interference bandpass filter
Purpose:Color separation for tricolor photography
UV/IR blocking:yes, up to 1150 nm
Substrate:Precision polished optical glass
Antireflective coating:Completely resistant against high humidity, scratches and aging effects
Filter thickness:1 mm
Parfocal:with other Astronomik filters
Ring:Aluminium
1 Filter in plastic box



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