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Astronomik ProPlanet 642 IR Pass Filter - 36 mm Round - P642-36

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SKU: ASF-P642-36

Astronomik ProPlanet 642 IR-Pass Filter - 36 mm


Astronomik's most recent contribution to their ProPlanet IR-Pass line of filters, the ProPlanet 642 BP offers an extensive range of daytime IR imaging applications, along with high resolution lunar and planetary imaging, and capturing spectacular photos of objects in the H-Alpha portion of spectrum when employed for astrophotography.

The P642 IR-Pass Filter offers a 200 nm spectral window between 642 nm and 842 nm. As opposed to the other two Astronomik ProPlanet filters, the P642 blocks the longer infrared. Astronomik is now providing users with three separate options for their IR-imaging needs, this P642 filter as well as their other two ProPlanet filters, the 742 and 807. For best imaging, the ProPlanet 642 will frequently be the ideal choice.

Daylight IR-Imaging:

  • High contrast images with excellent color rendition
  • Transparent images with "wood effect"
  • No hot spot in the longer IR
  • Short exposure times analogous to regular VIS-imaging
  • Best-suited for infrared videos


High Resolution Lunar & Planetary Imaging:

  • Short exposure times
  • Efficient decrease in seeing
  • Improved contrast
  • Longer IR obstruction removes ghosting and allows peak sharpness


Deep-Sky Astrophotography of H-Alpha Regions:

  • Best transmission of H-alpha line at 656 nm
  • FWHM of about 40 nm with astro-modified Digital SLR cameras
  • Spectacular contrast in moonlight or with severe light pollution
  • Filter is priced reasonably for H-Alpha imaging amateurs
  • Camera display plus LiveView facilitates simple focusing


Technical Specifications


  • 96%+ transmission for 642 nm to 842 nm wavelengths
  • Blocks wavelengths between 350 nm and 630 nm
  • Parfocal with any other filter available from Astronomik
  • 1 mm glass thickness
  • Offers complete insulation from the effects of scratching, aging, and high humidity
  • Diffraction limited, this filter will not compromise the optical efficiency of your telescope
  • All Astronomik filters arrive with a long-lasting plastic filter case of superior quality