Clouds transforming in the sky on a hot summer afternoon , a time lapse video captured in near infrared light.
This time lapse was more of an experimental piece than anything else. I did try this one other time, but because of the way infrared light works it didn’t work very well. Unlike doing a time lapse under normal circumstances where a very wide spectrum of light is being passed to the camera’s sensor. In near infrared only a very narrow spectrum of light waves are being passed to the camera’s sensor.
In a situation where there are constant levels of light there wouldn’t be an issue, though in a situation where clouds of varying density are passing over the sun. Changing light levels drastically it becomes very difficult to capture enough frames in sync to string together enough photos for a smooth time lapse. In fact you will notice in this time lapse some flicker. This is a direct result of what I previously mentioned.
The Process Of Creating Infrared Photography And TIme Lapse Videos
This footage was captured using a full spectrum modified Canon 70D DSLR with an attached 18mm-55mm f3.5 lens. An additional 920nm narrow band IR filter was placed over the front of the lens to filter all visible light out. This filter only allows a very narrow bandwidth of invisible near infrared light within the 920nm range to be filter to the cameras sensor. This spectrum of light is not visible by the human eye, though as you can see by watching the time lapse, is visible to a digital CMOS camera sensor.
The camera is then attached to a laptop with the software Backyard EOS installed on it. This software is generally only used for astrophotography work, though it works equally as well for setting up and scheduling image acquisition sessions. So I use it on allot of my time lapse videos as well.
With all equipment set up I begin capturing photos every 4 seconds in RAW format. Capturing in RAW format rather than .jpg is very important, especially when shooting in near infrared. So keep that in mind is you plan to try your hand at infrared photography.
Once enough data has been captured the RAW files are opened in Adobe Camera RAW where the levels and curve of each frame is corrected. The files are then saved in a .tiff, or .jpg format and are opened in a Adobe Premier Pro where they are sequenced into a single video file.
This is a rather brief explanation of the process behind the work. If your interested in more in-depth tutorials stay tuned. I am working on a couple tutorials now that will are much more detailed and informative than this short article.