Astronomik ASIRP8071 - ProPlanet 807 IR Pass Filter, 1.25", Planetary Filter

The ideal addition to the Astronomik ProPlanet IR 742 for imaging the moon and planets with telescopes larger then 10" (250 mm) when the seeing is poor.

This filter is an ideal complement to the ProPlanet IR 742 for use with converted DSLR cameras, CCD/CMOS cameras and Webcams. The effects of seeing are distinctly reduced. It is your entry into previously unknown dimensions of photography of the moon and the planets.

The ProPlanet IR 807 only allows infrared light with wavelengths of more than 807 nm to pass. In this wavelength range the effects of seeing are significantly lower than in the visible spectrum of the human eye. This allows much sharper images than are usually obtained from your device and location. Another advantage is that the sky background of advanced dawn is dark and even allows photography of planets and moon at daylight.

Especially for Mars photography, this filter lets pass the spectral range with the greates detail.

Main use:

The Astronomik ProPlanet IR 807 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 807 nm to pass. Due to this behavior, the part of the spectrum that is most sensitive to bad seeing is rejected. This approach does a big improvement to the imaging of planets and the moon. The image is more steady than the image in the visible light.

Other uses:

The Astronomik ProPlanet IR 807 is designed to be an addition to the Astronomik ProPlanet IR 742, if the seeing is extremely bad and a larger telescope is used.

For most cameras, the exposure times doubles, compared to the Astronomik ProPlanet IR 742 or imaging in visible light, if the Astronomik ProPlanet IR 807 is used.

Darkens the background during twilight

Imaging of bright planets, stars and comets by day

Imaging of young stars in dust clouds and stellar nurseries

Alternatives:

If the seeing is not so bad or if the telescope is smaller than 10" (250 mm), we recommend the use of the Astronomik ProPlanet IR 742.

Suitability:

Visual observation (dark skies): Unsuitable, the eye is insensitive at this spectrum

Visual observation (urban skies): Unsuitable, the eye is insensitive at this spectrum

Film photography: Unsuitable

CCD and CMOS photography: Reasonable, for special IR photography (as chlorophyll)

DSLR photography (original): Unsuitable

DSLR photography (astro modified): Unsuitable

DSLR photography (MC modified): Good, for IR daylight photography, longer exposure time

Webcam / Video (Planets): Very good, rejects problems with seeing, particularly with telescopes larger 250 mm aperture

Webcam / Video (Deep Sky): Very good, rejects problems with seeing, particularly with telescopes larger 250 mm aperture

Technical Data:

more then 97% transmission for wavelengths of 807 nm to 1100 nm

blocking of wavelengths between 350 nm and 790 nm

Parfocal with other Astronomik filters

Glass thickness: 1 mm

Completely resistant against high humidity, scratches and aging effects

Diffraction limited, the filter will not reduce the optical performance of your telescope!

Astronomik filters are delivered in a high-quality, long lasting, filter box

Spectral transmission curve:

The horizontal axis is the wavelength in nanometers (nm). 400 nm is deep blue, at 520 nm the human eye senses green and at 600 nm red. At 656 nm is the famous "H-Alpha" emission line of hydrogen.

The transmission in % is plotted on the vertical axis.

The red line shows the transmission of the filter.

Visual filters: The grey line in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510 nm and drops to longer and shorter wavelengths. You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity at 656 nm is 0% at night!

Photographic filters: The grey line in the background shows the sensitivity of a typical astro camera sensor.

The most important artifical emission lines are shown in orange. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), which are used in nearly all streetlights.

The most important emission lines from nebulas are shown in green. The most important lines are from ionized hydrogen (H-alpha and H-beta) and double ionized oyxgen ([O III]). The square brackets indicate that these lines are forbidden.