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Astronomik SII 12 nm CCD Filter - 36 mm - SII-36

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Astronomik SII 12 nm CCD Filter - 36 mm

  • Astronomik SII CCD Filters are made for CCD photography with this particular model presented in a thin 36 mm threaded round cell
  • Made to the highest technical standards to provide the optical efficiency necessary to execute deep sky imaging applications with your CCD camera
  • Ionized sulfur (SII) light is allowed to be transmitted while the whole remainder of the visual spectrum plus IR is blocked
  • FWHM bandwidth of approximately 12 nm
  • An ideal filter for planetary nebulae and supernovae remnant imaging
  • German-made for superior optical quality!

More About the Astronomik 36 mm SII 12 nm CCD Filter

This 36 mm Round SII CCD Filter from Astronomik is the ultimate narrowband imaging filter. For common CCD cameras, this filter's 12 nm full width at half maximum (FWHM) is ideal as it allows extremely fast optics to be employed. The f/number application range is between 1:2.8 and 1:15. Astronomik filters only experience transmission losses and chromatic distortions when severely bright aperture ratios of 1:2 or more are involved, whereas they arise much more frequently with other filters. An additonal advantage of 12 nm filters is the enhanced guide star availability for cameras with an integrated autoguider. The Astronomik SII 12 nm CCD Filter has a transmission of up to 99%.

A great filter for coping with heavy light pollution, the Astronomik SII 12 nm CCD Filter boosts contrast between objects in the SII emission line and the skyglow background, and provides complete blockage of mercury (Hg) and sodium (Na) as well as other sources of artificial light and skyglow simultaneously. The substrate quality of this filter is excellent, showing the same needle sharp stars you typically see using your normal telescope.

All unwanted visible and IR spectral band wavelengths are fully obstructed with this 36 mm Round SII 12 nm CCD Filter from Astronomik. Like all Astronomik filters, the 36 mm SII 12 nm CCD Filter is parfocal with all other Astronomik filters. It has an ultra thin substrate and is diffraction limited to preserve your telescope's optical performance. Coatings offer total protection from scratching as well as the effects of aging and high humidity. All Astronomik filters arrive in a long-lasting, supreme quality plastic filter container.

Transmission Specifications

  • Transmission for the SII line is over 97%
  • Nearly complete obstruction of the entire rest of the visual spectrum
  • Obstructs undesired wavelengths in the infrared