This is a tutorial on how to convert your Logitech C910 or C920 webcam into an HD nightvision camera by removing the Hot Mirror Filter. For the C920 please read the comments. Once you have completed the conversion, your camera will be very sensitive to infrared light. However, it should be noted that one of the main reasons for the IR filter’s existence is to get a sharper image. The quality of the image is thus affected and furthermore your webcam image will have a very strong red tint. (Of course if you would use a lightsource without infrared, such as an LCD, that would not be the case.) Furthermore, in my case the autofocus does not seem to work very well after the conversion. The manual focus on the other hand works just fine, This is all I need for my purpose.
Please note that you are converting the camera at your own risk.
Below you find an image taken with my converted C910. The picture was taken through a 850nm IR filter. The LED’s are 950nm. Looking through the filter the room appears absolutely pitch black to the naked eye.
Let’s get started.
1. Get the camera, some small screwdrivers and a needle.
With a needle unclip the microphone guards. You have to move the clips seen below inwards to be able to pull them off sideways.
3. That’s how the camera looks without the microphone guards on.
4. Remove the glass by using a screwdriver as a lever. Loosen Xpress money online all four edges…
5. Remove the lens by turning it anticlockwise. Please inspect the lens closely before you remove it and make sure you remember the exact position it was in.
6. Turn the lens around and on the back of it is the Hot Mirror Filter. With a needle you can squeeze it out.
7. In my case the thin IR reflective filter broke. It really is quite brittle. After removing it I realized that it was actually glued in. So maybe one could remove it if the lens was preheated with a hairdryer.
After removing the IR filter completely, put the webcam back together in reverse order. When you install the lens back into the camera make sure your focus works properly by manually changing it using the logitech software. Screw the lens in as much as you have to to get the optimal focus range back.
As requested, here are two photos taken with the C910 after the conversion. The first one was taken outside on a rainy day and the second one inside under a halogen spotlight.
Whilst the quality outdoors seems to not have suffered too much, one can clearly see the misrepresentation of colours on the leaves.
Under a halogen spotlight however the infrared sensitivity of the camera becomes appearant. Image quality clearly suffers in this condition. Clearly the lens on the camera is not made for infrared light. resulting in a somewhat ‘misfocused’ image. The distortion and red tint are not present power led’s are used for indoor lighting as they usually do not emmit any infrared light.
That’s it, enjoy your nightvision HD camera.