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Infrared Rainbow on Sepember 5th, 2011

Rainbows also occur outside the visible spectrum, for example in the near infrared, showing all the properties of normal rainbows like supernumeraries. The images below were taken through an infrared filter, the white balance set on a green background in order to show the Wood effect. During processing, the red and blue channels were switched, so that the rainbow again shows a red outer rim. The rainbow was visibly reddened ín daylight as the sun was already low.

Most digital cameras are suited for infrared photography. Unfortunately this is not true for all lenses, internal reflections can lead to disturbing hot spots in the centre of the image. Prime lenses are better than zoom lenses. Make sure that your cameras allows manual white balance settings. The raw image appears in a vivid magenta.

Because of its ultra-thin infrared-blocking filter in front of the chip, the Leica M8 is a good choice for infrared  photography. Nevertheless exposure times around 1/2 second at f/8 for rainbows make a tripod necessary.  Note that lenses focus differently in infrared light, so that some tests must be made. Stopping down the lens helps a lot to increase the zone in focus. Unfortunately most modern lenses have no infrared markings. Make sure not to purchase an infrared blocking filter instead of an infrared filter! 


Above; Leica M8, Summarit 35 mm f/2.5, Heliopan infrared filter 715 nm. This filter does not block all colours. Processed with Adobe Photoshop CS5 from the raw file. Below: Leica M8, Summarit-M 90 mm f/2.5, Heliopan infrared filter 780 nm. The colours are already less distinct. Image processing with Photoshop CS from the raw file.


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