Astronomik ProPlanet 742 BP IR-Pass Filter

AstronomikSKU: 8h00g3

Size: 1.25" (M28.5)
Sale price$57 CAD
In stock: 2 unit(s) - Most orders placed by 2PM EST will be shipped out the same day (weekdays)


Ideal filters for the observation of the moon and planets, notably Mars, with telescopes from 6" (150mm) aperture and up


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.  BP is short for Bandpass.

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 has a big improvement on the imaging of planets and the moon. The image is more steady than the image in the visible light with nearly identical exposure times.

Jupiter, aufgenommen mit L-RGB Filtern und Astrnomik ProPlanet 742

Jupiter, imaged with L-RGB Filter (left) and Astronomik ProPlanet 742 (right)


Comparing sharpness in IR-R-G-B at Saturn


Comparing sharpness in IR-R-G-B at Saturn


Comparing L-RGB versus IR-RGB at Saturn


Comparing L-RGB versus IR-RGB at Saturn

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.


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.

more information about the photographic Astronomik filters



  • 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 other Astronomik filters
  • Glass thickness: 1mm
  • 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

Some Sizes Available From Astronomik (More added regularly) - Please ask us if we don't have a price listed for the one you would like

  • 1.25" (M28.5)
  • 2" (M48)
  • T-thread Cell (M42x0.75)
  • SC-Cell (2" / 24TPI)
  • Ø27mm
  • Ø31mm
  • Ø36mm
  • Ø42mm
  • Ø50mm
  • 50x50mm
  • EOS APS-C Clip-Filter
  • EOS M Clip-Filter
  • EOS XL Clip-Filter
  • Sony Alpha Clip-Filter
  • Nikon XL Clip-Filter
  • Nikon Z XL
  • Pentax K Clip-Filter
  • M52

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