Astronomik ProPlanet 742 IR-pass Filter
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Astronomik ProPlanet 742 IR-pass Filter

£54.00
  (2 Reviews)
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About this product

Model:  ak_pp_742-ir_125
Part Number:  10225125

The Astronomik ProPlanet 742 IR-pass Filter is ideal for imaging the Moon and planets, notably Mars with telescopes from 6" (150mm) 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.

FEATURES

  • More then 96% transmission for wavelengths of 742nm to 1100nm
  • Blocking of wavelengths between 350nm and 730nm
  • Optically polished substrate, striae-free and free of residual stresses
  • Not sensitive to high humidity or ageing effects
  • Scratch-resistance!
  • Excellent quality substrate, diffraction limited - the optical performance of your telescope will not be reduced
  • Parfocal with other Astronomik filters
  • 1mm Glass Thickness
  • Supplied in a high-quality, long lasting, filter box

Main use

The Astronomik ProPlanet IR 742 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 742nm 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 reflectivity 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.

Transmission Chart

  • The horizontal axis is the Wavelength in Nanometers (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous "H-Alpha" emission line of hydrogen.
  • The transmission in % is plotted on the vertical axis.
  • The blue line shows the transmission of the filter.
  • The most important emission lines from nebulas are shown in orange. The most important lines are from ionised Hydrogen (H-alpha and H-beta) and double ionised oxygen (OIII).

The major emission lines of artificial light pollution:
| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm |
| Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |

The major emission lines of nebulas:
H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm

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,
  • CCD 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 742nm to 1100nm
  • Blocking of wavelengths between 350nm and 730nm
  • Parfocal with all Astronomik filters
  • Thickness of 1mm
  • Not sensitive to moisture, scratch resistant or ageing
  • Optically polished substrate, striae-free and free of residual stresses
  • Astronomik filters are delivered in a high-quality, long lasting, filter box

 

Customer reviews

Average Rating (2 Reviews):  
Write a Review and share your opinions!
Rating (max 5):  
If only the clouds would clear ...
16 March 2022  | 

Sadly, I haven't yet been able to try this out (clouds, humidity, wind and other commitments) but the service was excellent, and it's hard to believe that the filter won't be fun to use.

Rating (max 5):  
Not a good fit in Nikon Z Full Frame bodies
27 October 2021  | 

I bought this filter as part of a set of four for a full spectrum converted Nikon Z6 to allow normal photography (with a UV-IR block filter) and IR photography with this IR Pass filter.

As soon as I received them, I put one into the Z6 but found that contrary to the Astronomic sales video the filter dropped out at the slightest nudge of the camera. I've tried other full frame Z bodies with the same results. Yes, the filters stay put in the bodies, just, but it only requires the slightest nudge for them to drop out, I certainly cannot replicate what the video shows of multiple reasonably forceful taps without dislodging the filters.

Obviously, a lens or T mount holds any filter in place so for Astrophotography or where you want to fit a lens for a whole shoot it is not a big problem. So, if you are willing to accept a loose fit they are good.

I’ve watched the install video several times to check I’ve not missed anything subtle in the fitting and have tried multiple times with the same result. There are no sprung pieces on these filters that engage with the ridges in the Z body cavity, so they rely on the size being correct for an interference fit - other manufacturers Z clip-ins have a form of spring retention on the upper edge that does work.

I did take the time to test and check all four filters received and as far as filter quality is concerned, they are great but fitting wise and staying in place is concerned they are no good for me. Other clip in filters, not Astronomik, fit and stay fitted fine, so, I have returned them and will buy alternatives. I've given three stars as the filter quality is good, but the fitting is not.

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