Astronomik - Photometric Filters

The Astronomik CLS is our inexpensive solution for the visual deep-sky
observation, b&w photography and CCD observation. The Astronomik CLS filter
is the right filter to gain the contrast of nearly all objects under
light-polluted skies with all sizes of telescopes. Due to the design of the
transmission curve the filter reduces the sky background and gas nebulae
planetary nebulae as well as open clusters, globular clusters and galaxies
are seen better. The Astronomik CLS blocks the emission of Hg and Na
streetlights as well as all Skyglow-lines . All major emission lines from
deep-sky objects are passed without suppression. As you can see from the
chart below the most important part of the eye's night-sensitive region is
passed with maximum transmission. 

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. 

These new filters serve particularly the needs of the digital photographer
imaging the solar system with electronic cameras or Webcams (with IR-block
filter removed) at long-focus telescopes.