Astronomik IR Blocker

Astronomik IR Blocker 1,25" (M28.5)

Astronomik IR Blocker 1,25" (M28.5)
Astronomik IR Blocker 2" (E48)
Astronomik IR Blocker 31mm, unmounted
Astronomik IR Blocker 36mm, unmounted
Astronomik IR Blocker 38mm, unmounted
Astronomik IR Blocker 50mm, unmounted
Astronomik IR Blocker SC Rear Cell (2" / 24TPI)
Astronomik IR Blocker T-Mount (M42x0,75)
Astronomik IR Blocker Transmission Curve

Click the image for full resolution

Infrared-blocking filter for digital photography.

The filter should be used as a standard at all imaging applications with sensors having a low sensitivity in the UV, e.g. Webcam, DSI and LPI from Meade or most video systems. Put this filter in front of your camera and you will get rid of all problems caused by IR like bright halos around all objects and a very soft overall image.

If you compare the transmission data of the Astronomik IR-blocker with the data from other sources, you will notice, that most other manufacturers would call this already an UV-IR blocker. The filter WE call an "UV-IR blocker" is superior to any UV-IR blocker from other manufacturers worldwide!

The IR-blocker is optimized for systems with focal ratios between f/0.5 and f/50. The typical transmission is higher than 99%.

Main use

The IR Blocker gives you a perfect parfocal filter. It blocks all IR light without modifying the visual part of the spectrum. It is also great as a dust protection for your telescope and camera.

Other uses

  • As a dust protection of Schmidt-Cassegrain, Schmidt-Newton or Maksutov system or as a dust protection in front of DSLR camera.
  • As an alternative instead of the UV-IR-Blocker if your camera has a low sensitivity at short wavelengths.
  • As an alternative instead of the MC Clear if your system has any refracting elements

Alternatives

You should think about using the UV-IR blocker if your camera has a high sensitivity at short wavelengths. Think about using the MC Clear glass if you have a system without any refracting elements. If you do color imaging from light polluted places, please think about using the CLS CCD filter for the luminance data instead!

more information about the photographic Astronomik filters

Transmissionsgraphik
How to read the 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 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 ~510nm 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 656nm is 0% at night!
  • Photographic filters: The grey line in the background shows the sensitivity of a typical CCD 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 (OIII).

The major emission lines of artifical 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): It depends, for dust protection only
  • Visual observation (urban skies): It depends, for dust protection only
  • Film photography: It depends, for dust protection only
  • CCD photography: Very good, if used with optics which contain refracting elements
  • DSLR photography (original): It depends, for dust protection only
  • DSLR photography (astro modified): It depends, for dust protection only
  • DSLR photography (MC modified): Very good, if used with optics which contain refracting elements
  • Webcam / Video (Planets): Very good, if used with optics which contain refracting elements
  • Webcam / Video (Deep Sky): Very good, if used with optics which contain refracting elements

Technical Data

  • 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
  • Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past

The filter is available in the following sizes:

Filter displayed products below by their features

IR-Block Filter

  • ASTRONOMIK IR Block filter; T-thread cell (M42x0,75)

    ASTRONOMIK IR Block filter; T-thread cell (M42x0,75)

    excl. VAT (Non-EU): €46.22 incl. VAT (EU): €55.00


  • ASTRONOMIK IR Block filter; SC-cell (2" / 24TPI)

    ASTRONOMIK IR Block filter; SC-cell (2" / 24TPI)

    excl. VAT (Non-EU): €74.79 incl. VAT (EU): €89.00


  • ASTRONOMIK IR Block filter; 1,25" (M28,5)

    ASTRONOMIK IR Block filter; 1,25" (M28,5)

    excl. VAT (Non-EU): €32.77 incl. VAT (EU): €39.00


  • ASTRONOMIK IR Block filter; 2" (M48)

    ASTRONOMIK IR Block filter; 2" (M48)

    excl. VAT (Non-EU): €74.79 incl. VAT (EU): €89.00


  • ASTRONOMIK IR Block filter; Ø50mm

    ASTRONOMIK IR Block filter; Ø50mm

    excl. VAT (Non-EU): €74.79 incl. VAT (EU): €89.00


  • ASTRONOMIK IR-Blocker in Fassung M55-M77

    ASTRONOMIK IR-Blocker in Fassung M55-M77

    excl. VAT (Non-EU): €150.42 incl. VAT (EU): €179.00


6 Item(s)

per page

Grid  List 

Set Descending Direction