Astronomik MC Glasses for EOS DSLR Full-Spectrum-Modification

Astronomik MC Glas for EOS DSLR Astro Modification(5D)

Astronomik MC Glas for EOS DSLR Astro Modification(5D)
Astronomik MC Glas for EOS DSLR Full-Spectrum-Modification(300D)
Astronomik MC Glas for EOS DSLR Full-Spectrum-Modification(350D, 20D, 30D)
Astronomik MC Glas for EOS DSLR Full-Spectrum-Modification(400D)
Astronomik MC Glas for EOS DSLR Full-Spectrum-Modification(450D, 500D, 550D, 600D, 1000D, 1100D)
Astronomik MC-Karglas transmission curve

Click the image for full resolution

Astronomik MC glasses for Full-Spectrum Modification of Canon EOS DSLRs

Special glass for the retrofitting of Canon® EOS DSLR cameras in order to achieve the full spectral sensitivity of the CMOS sensor.

The Astronomik MC clear glass is a precision optically polished and multicoated special glass. The glass is available in different sizes according to the requirements of the various Canon ® EOS DSLR cameras.

MC glass is mainly used to compensate the optical path of the removed original filter of the camera. Furthermore, it prevents dust from falling directly on the sensor, which may cause image defects.

The MC has no filter effect. It is blocking neither infrared nor ultraviolet light. The transmission is typically higher than 99.7%.


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

The retrofitted DSLR Camera needs for proper imaging with camera lenses, light refracting elements such as flat field lenses or focal reducers, an additional filter in the beam path that blocked the infrared or visible spectrum of light, depending on the desired spectral range. For everyday photography, we recommend an Astronomik OWB-Clip filter that is snapped directly and without any tools into the camera body. The sensitivity and the white balance of the camera is being restored to its original state.

For astrophotography in the visible light we recommend at least an L-filter in the beam path. For IR photography Astronomik offers EOS Pro 742 or 807 IR pass Clip filters.

The filter is available in the following sizes

Astronomik MC glass for Full-Spectrum Modification of EOS DSLR's

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