Manufacturer: Astronomik Filter
Product number: 8H00G3

EUR 59,00


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  • On stock
  • Only 2 pcs left in stock





rating: 5.0 of 5
  • Details..
  • Technical data..
  • In the box..
The ideal filter for digital photographing the moon and planets, notably Mars, with telescopes from 6" (150 mm) aperture.

The ProPlanet IR 742 only allows infrared light with wavelengths of more than 742 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 so the filter even allows photography of the planets and the moon at daylight.

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

Main use:

The Astronomik ProPlanet IR 742 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 742 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 with nearly identical exposure times.

Other uses:
Besides astrophotography the filter allows you to get stunning results in nature photography. If an EOS Clip Filter is used in an MC-modified DSLR, you get tremendous results imaging the flora. The filter cuts off the part of the spectrum where Chlorophyll looks green and shows its high reflectivety in the near infrared. If trees are photographed in spring and summer under blue skies, you get stunning images with white trees and clouds in front of a near black background.
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:

When the seeing is very bad and the instrument is 10" (250 mm) or larger, the Astronomik ProPlanet IR 807 may be the better choice.

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: It depends on the film
CCD and CMOS photography: Reasonable, for special IR photography (as chlorophyll)
DSLR photography (original): Unsuitable
DSLR photography (astro modified): Unsuitable
DSLR photography (MC modified): Very good, for IR daylight photography
Webcam / Video (Planets): Very good, rejects problems with seeing
Webcam / Video (Deep Sky): Very good, rejects problems with seeing


Technical Data:
more then 96% transmission for wavelengths of 742 nm to 1100 nm
blocking of wavelengths between 350 nm and 730 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.

Transmission between 742 nm and 1100 nm:more then 96%
Blocking:wavelengths between 350 nm and 730 nm
Carrier material:optically polished substrate
Glass thickness:1 mm
Parfocal:With all other Astronomik filters
Anti-reflective coating:No moisture-sensitivity, no aging, and totally scratch-proof
Cell:aluminium
1 Filter in plastic box



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Reviews

Written by Michael Riedel
on 2021-12-29

"Für die Luminanzaufnahme eines LRGB-Bildes bringt dieser Filter bei Planetenaufnahmen einen zusätzlichen Detailgewinn und kann auch noch sehr gut an einem 10 Zoll Schmidt-Cassegrain mit Filterrad verwendet werden."

Written by Sergey Fefilov
on 2016-07-20

"gutes Produkt, empfehlen, danke"