If you look at your interchangeable-lens camera's menu, you'll probably find a setting for Long Exposure Noise Reduction. In fact, many cameras have this activated by default. It's a cool tool, and here's a simple explanation of how it works and when you might not want to use it. What's it for? When you do a long exposure, let's say something longer than one second, your camera's sensor is activated the whole time the shutter is open. As it's working, it's also generating heat, and that heat (as well as other stuff) can cause image noise. … [Read more...] about Long Exposure Noise Reduction (I’m Eating Crow)
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