Infrared light lies between the visible and microwave portions of the electromagnetic spectrum. Infrared light has a range of wavelengths, just like visible light has wavelengths that range from red light to violet. “Near infrared” light is closest in wavelength to visible light and “far infrared” is closer to the microwave region of the electromagnetic spectrum. The range I am using is the Near infrared wave length in a modified sensor in a Canon 1Ds MK2. No lens filters are necessary or are conversions in Photoshop. this camera works in the 700nm frequency and 430Thz-300 Ghz. Visible light has a photo energy of about 3.3eV but this sensor is about 1.7eV which means if I set the ISO on the camera to 100 my meter would be exposing about 3 stops under exposed. Using the cameras metering is not accurate and I must bracket a lot and use a tripod. At high noon sunlight my exposure is around 1/4 second @ F16.0 The green spectrum is exposed to white and the blue spectrum goes to black. Time of day is very important as IR waves diminish quickly as the sun’s angle drops lower. Over cast sky filter out the IR and the images are awful with no contrast at all. The higher the altitude the darker the sky will be.
I love working with this medium in digital because unlike IR film I get immediate feed back in the LCD and heat is not a big problem where as film was sensitive to heat and could ruin you image. Even touching the film with your fingers on the unexposed film could affect the image.
I hope you like these images. IR doesn’t work for everything but in select cases it is spectacular.
Click on each image to see the full size.