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Filters > Nebulae filters > H-Alpha Filters > Astronomik > H-alpha 12nm > Astronomik Filters 2" 12nm H-alpha CCD filter
Product no.: 16752

Filters 2" 12nm H-alpha CCD filter

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Product description

Astronomik H-alpha 12nm Filter

The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.

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

The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%.

Another advantage of the 12nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6nm filter you often won’t find a usable guidestar.

The range of application extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play.

Main use

The Astronomik H-alpha-CCD (12nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background. Our Astronomik H-alpha-CCD (12nm version) completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.

Specifications

Capacity


Connection (to the telescope)
2"
Coating of optical system
multiple
Mount material
Aluminium
Frame
2"

General


Series
H-alpha 12nm
Type
Filters
Type of build
line filter

Area of application


Visually useful
-
Useful for photographs
yes
Anti light-pollution
yes
Daylight and twilight observation
-
Mercury
-
Venus
-
Mars
-
Jupiter
-
Saturn
-
Uranus
-
Hydrogen nebulae
yes
Planetary nebulae
-
Supernova remains
-
Comets
-
Central stars
-
Twin stars
-
Galaxies and star clusters
-
Astronomik Filters 2" 12nm H-alpha CCD filter
How do I interpret these transmission curves?

  • the wavelength is plotted in nanometers on the horizontal axis. 400nm corresponds to deep blue, 520nm to green and at 600nm to red
  • transmission, in %, is plotted on the vertical axis
  • visual filters: The gray curve shows the relative sensitivity of the dark adapted human eye at night
  • photographic filters: The gray curve shows the relative sensitivity of a typical CCD sensor
  • orange: the main emission lines which contribute to artificial sky glow, e.g lines from mercury (Hg) and sodium (Na)
  • green: the most important emission lines from nebulae, such as the lines from hydrogen (H-alpha and H-beta) and the lines from oxygen (OIII)

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