How do you choose the right ISO setting? When it's dark, most people generally just choose the highest ISO setting thinking that will make the picture better. When it comes out though, it's either too dark, or there's so much noise on the photo it turns ugly.
Here's a sample (warning, big file)
http://www.davidleetong.com/images/articles/50D_18200/50D_ISO12800_18-200IS.jpg
On the other hand, some people don't even bother checking the ISO, then their picture all turns out blurry. Something like this.
http://farm1.static.flickr.com/99/364480266_40bcbbc201.jpg
The best way is to try to keep your ISO to no more than 400 unless you really really have no choice.
It is better to use the flash and keep ISO between 100 to 400 than to use ISO 800 and up. The only time I suggest using ISO 800 and up is if you are not allowed to use flash like in a concert, or dark auditorium. You should also use a higher ISO if your flash cannot reach your subject like when you have to use high zoom to get the right shot.
The best way to gauge if you're using the right ISO is to look at your shutter speed. This is usually a number at the bottom of your screen that could say 1/60 or 100 or 0.5" (I will explain what shutter is next).
If you are not using a tripod. It's best to make sure your shutter speed is at least 60 and up. If you have your ISO set at 200 indoors and when you focus, you see your shutter showing 40, 30 or lower. You should either use a flash or bump your ISO higher until you see at least 60 on your shutter speed.
Of course, these are just general guidelines. Part of the beauty of photography is you can manipulate all of these settings to get more creative. But if you want just a clear picture, make sure you have these settings.
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