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a collection of photos by Eric Chesak

www.ericchesak.com

  1. Galleries
  2. Infrared

Science

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  • Processed Solar spectrum from a full-spectrum modified Canon 40D, using a home-made holographic diffraction grating.

    Processed Solar spectrum from a full-spectrum modified Canon 40D, using a home-made holographic diffraction grating.

  • Processed Solar spectrum from a full-spectrum modified Canon 40D, without (top) and with (bottom) an Astronomik Proplanet 742 IR filter.  These were recorded using a home-made holographic diffraction grating.

    Processed Solar spectrum from a full-spectrum modified Canon 40D, without (top) and with (bottom) an Astronomik Proplanet 742 IR filter. These were recorded using a home-made holographic diffraction grating.

  • Lumanance (black) and RGB data from the spectrum of a modified Canon 40D (clear glass filter modification).  

Note the dip in the peak of the luminance.  This is due to the absorbance of the brown-orange stained emulsion from the potassium dichromate bleaching solution.

    Lumanance (black) and RGB data from the spectrum of a modified Canon 40D (clear glass filter modification). Note the dip in the peak of the luminance. This is due to the absorbance of the brown-orange stained emulsion from the potassium dichromate bleaching solution.

  • This graph contains the same luminance spectrum, but also has detail of the spectrum obtained with an Astronomik Pro-Planet 742 IR filter.

    This graph contains the same luminance spectrum, but also has detail of the spectrum obtained with an Astronomik Pro-Planet 742 IR filter.

  • The set-up of the Spectroscope-in-a box.

    The set-up of the Spectroscope-in-a box.

  • Razor blades used for the slit.  Close & parallel spacing was achieved by using a 0.002" piece of shim stock as a spacer, between the blades.

    Razor blades used for the slit. Close & parallel spacing was achieved by using a 0.002" piece of shim stock as a spacer, between the blades.

  • The Camera-end, with a view of the holographic grating inside.

    The Camera-end, with a view of the holographic grating inside.

  • The Top spectrum is the full spectrum from a full spectrum Canon 40D, using a homemade transmission holographic grating. 
The bottom spectrum uses the same camera and grating, but includes the Astronomik Pro-planet 742 IR filter (hopefully aligned correctly). It may appear that the spectrum (with the filter) extends further in the IR, but it's just a difference in exposures of the two spectra.

These are raw, unprocessed spectra.

    The Top spectrum is the full spectrum from a full spectrum Canon 40D, using a homemade transmission holographic grating. The bottom spectrum uses the same camera and grating, but includes the Astronomik Pro-planet 742 IR filter (hopefully aligned correctly). It may appear that the spectrum (with the filter) extends further in the IR, but it's just a difference in exposures of the two spectra. These are raw, unprocessed spectra.

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  • Histogram 742nm + CWB

    Histogram 742nm + CWB

    This is the histogram of an IR image shot at 742nm. This image used a custom white balance. Notice the Histogram contains all primary colors.

  • Histogram 802nm, No CWB

    Histogram 802nm, No CWB

  • Histogram 802nm + CWB

    Histogram 802nm + CWB

  • Histogram 720nm, No CWB

    Histogram 720nm, No CWB

  • Histogram 720nm, no CWB

    Histogram 720nm, no CWB

  • Custom White Balance on 740nm IR filter

    Custom White Balance on 740nm IR filter

    Notice the balanced histogram in RGB, when using a CWB

  • Daylight White Balance on 740nm IR

    Daylight White Balance on 740nm IR

    Notice the huge imbalance of the Red values on the Histogram, when not using a custom white balance for IR. Generally, these images are more difficult to process, especially if the color swap method is desired.

  • Camera LCD with Custom White Balance & 740nm

    Camera LCD with Custom White Balance & 740nm

    Notice how easy it is to visualize the scene, with a CWB

  • Camera LCD with a Daylight White Balance & 740nm

    Camera LCD with a Daylight White Balance & 740nm

    Trying to compose a scene is much more difficult when viewing the IR image like this:

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Unless otherwise noted, all Photos, Images and Videos are Copyright C. Eric Chesak
Unauthorized use is prohibited

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