Skip to content

Astronomik ProPlanet 642 IR Pass Filter - 27 mm Round - P642-27

SKU: ASF-P642-27

Astronomik ProPlanet 642 IR-Pass Filter - 27 mm Round

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 the best imaging, the ProPlanet 642 will frequently be the ideal choice.

Daylight IR-Imaging:

  • Images feature high contrast and superior color presentation
  • Transparent images with "wood effect"
  • No hot spot in the longer IR
  • Short exposure times analogous to regular VIS-imaging
  • Ideally suited for infrared videos


High Resolution Lunar & Planetary Imaging:

  • Short exposure times
  • Efficient decrease in seeing
  • Improved contrast
  • Longer IR is blocked to remove ghosting and facilitate maximum sharpness


Deep-Sky Astrophotography of H-Alpha Regions:

  • Finest H-Alpha line transmission at 656 nm
  • FWHM of approximately 40 nm with DSLR cameras that have been astro-modified
  • Incredible contrast in moonlight or in heavily light polluted conditions
  • Sensibly priced filter for casual H-Alpha imagers
  • Camera display plus LiveView enables easy focusing


Technical Specifications

  • More than 96% transmission for the 642 nm to 842 nm wavelength range
  • Blocks 350 nm to 630 nm wavelengths
  • Parfocal with every other Astronomik filter
  • 1 mm glass thickness
  • Coatings offer complete resistance to the effects of scratching, aging, and high humidity
  • This filter is diffraction limited and therefore will not reduce the optical performance of your telescope
  • Astronomik filters come with a durable, high quality plastic filter case