Test your remote's batteries with a digital camera
You can use a run-of-the-mill digital camera to check if your remote is on the fritz. Your remote emits infrared light that your eyes cannot detect, but a digital camera can see this light quite easily. As you can see in the picture above, I checked my television remote's batteries with a simple Sony Cyber-shot camera. Obviously, if the batteries were dead, or if the remote was busted, you wouldn'
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How To Use Your Canon DSLR As A Webcam
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