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C.Fn 3: Long Exposure Noise Reduction Although the Rebel's advanced sensor and processing technology do a great job of noise reduction, long exposures can still present some problems. Using this function for exposures that are longer than 1 second reduces (but does not eliminate all) noise, resulting in a smoother image. The downside to this function is that it takes the camera more time to reduce noise than it does to process the image, and additional pictures can not be made until the previous one is processed.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.