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Astronomik - LRGB Type 2 Filter Set - 50mm Square Unmounted

Model#: LRGB-50SQ

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Manufactured by: Astronomik

Details

Astronomik LRGB Filter Set - 50mm Square - Unmounted - Type 2c

These filters provide a natural color reproduction of planets, stars, emission- and reflection nebulas. The transmission properties of the L-RGB filters are optimized for CCD astrophotography. The set allows to take images in correct color for all types of objects. Where other brands make strange compromises, we do the best color 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 considerations have been very important for the design of Astronomik LRGB filter set:

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

Most importantly, a color correction tool should be provided to astrophotographers that offers a simple and efficient editing process. To maintain the color, Astronomik has calculated their filter set 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 colorimetry and color spaces. Astronomik has solved the special problems of astrophotography for you.

Due to the high-precision machining of the carrier substrate, Astronomik filters are parfocal with errors below all usual margins. In order not to be the flaw 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 color image are not a problem at all. 

The L-RGB filter set divides the spectrum into its components red, green, blue and luminance. Thus color separation can be achieved with pure b/w CCD sensors. The separation corresponds to the color 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 image processing in the sRGB color space.

Astronomik LRGB Filter Set - 50mm Square - (Unmounted) - features: 

  • Parfocal with other Astronomik filters 
  • 1mm thick glass
  • 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
 
How to read the Astronomik L-RGB Transmission Curve chart (above): 
  • The Horizontal axis is the Wavelength in Nanometers (nm). 
  • 400nm is deep blue, 
  • at 520nm the human eye senses green and at 600nm red. 
  • At 656nm 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 ~510nm 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 656nm is 0% at night. 
  • Photographic filters: The grey line in the background shows the sensitivity of a typical CCD sensor. 
  • The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by 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 (OIII) . 
  • The major emission lines of artifical light pollution: | Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm | | Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm | 
  • The major emission lines of nebulas: H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm








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Product Series

The transmission curves of the Astronomik RGB filters are optimized for the CCD-astronomy: With these filter-set, we finally can offer filters that make color proof pictures of all objects possible. Continuum radiators like stars and galaxies as well as objects that shine only in single lines (e.g. planetary nebulae), are reproduced in their true colors. Because of the design of the band pass of the filters, the color sensitivity of the human eye is optimal reproduced. You get CCD- pictures, that show the object optimal in his colors, just as if you would see it, if your eye would be sensitive enough.

The Astronomik Type II filter will permit color pictures without an extra IR- cutoff filter, because each of the three filter will be blocked near to the infrared (~1150nm). All three filter have the same thickness, so that color images without focusing between the singular pictures will be possible. They are designed to work with nearly all CCD sensors available on the market. With these sensors you get pictures with a very good color balance. * Astro- optimized transmission curves for images without color-shifts * each filter blocks the IR, no additional filter necessary * Correct images as well for very red as for deep blue objects because of reproduction of the eye´s sensitivity * Transmission of nearly 100% * Same optical thickness of all filters * Insensitivity to high humidity, scratches and aging * Glass substrate of very high quality: You get the sharpest images your scope can deliver

Additional Information

Name Astronomik - LRGB Type 2 Filter Set - 50mm Square Unmounted
Manufacturer Astronomik
Model LRGB-50SQ