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Nikon CoolPix 2100 Infrared Sensitivity


camera overview


 
Camera: Nikon CoolPix 2100
Filter: none
Exposure time: 1/327.80
F-stop: 5.2
ISO speed: 100
Focal length: 4.7000
White balance: Automatic
EV: 13.1137

comments:
Camera: Nikon CoolPix 2100
Filter: Heliopan 715nm IR pass filter
Exposure time: 1/3
F-stop: 2.6
ISO speed: 277
Focal length: 4.7000
White Balance: Automatic
EV: 2.8721

comments: Fairly insensitive as most modern cameras. But its high-ISO performance is really good for such a small camera. I guess it pays off that it is only 2MP, as this leaves the sensor elements rather large.
Camera: Nikon CoolPix 2100
Filter: Heliopan 715nm IR pass filter
Exposure time: 1/2.30
F-stop: 2.6
ISO speed: 400
Focal length: 4.7000
White Balance: Manual
EV: 1.9587

comments: White balance on some leaves - pretty nice, but further decreases effective sensitivity.
 
The Nikon CoolPix does a pretty impressive job in IR. It's metering is ok in IR, and its white balance is pretty powerful so you can create rather good IR shots - with a tripod.
 
  visible 715nm 715nm + manual White Balance
R
G
B
What is really good to see here is the influence of white balance in colour channel sensitivity. The visible light shot has a rather even distribution. The standard 715nm image has much stronger red channel compared to blue and green. By white balancing on IR-white leaves, the camera is set to an even RGB distribution again. Apparently, overall sensitivity is decreased, as was noted in similar cases by other people and myself.





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