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Hopefully by now, you've had the chance to shoot with your Rebel at a higher ISOs and you have seen how as you increase ISO. You get an incredible ability to shoot in very low light. You have probably also seen that as you increase ISO, the noise in your images increases. Now it's not so bad up to about 400 and it's quite usable at 800 or even 1600, but still it's nice to have less noise in your image. Fortunately, your camera has noise reduction processes built into it and you can control these through a Custom Function.
If I go in here to Custom Functions, the fifth Custom Function is High ISO speed noise reduction. By default, it's set to Standard which means there is noise reduction applied to every image that you take, whether JPEG or Raw. But I've also got three different strength settings that I can use. And the reason I might want to play with these is that as you apply noise reduction, you possibly lose sharpness. So if you are finding that your images are little soft and you're wondering, well maybe when even I am shooting at ISO 1600 it's because of that noise reduction.
You could go in and change it to low, or if you are finding when you're shooting at ISO 1600, your images are noisier than you like. You could turn up the noise reduction. Put it on strong and you'll get less noise but possibly less sharpness as well. If you would like completely unadulterated images, you can disable noise reduction altogether. One note if you put noise reduction on strong, your maximum burst rate is possibly going to decrease because the camera is going to be doing a little more processing. So High ISO speed, we are talking about 800, 1600 and higher.
Fiddle with these and see if there's a setting that you like more than just the Standard. My personal experience is that Standard is usually the best for any situation that I am shooting in.
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