So you've become a good photographer, been out and applied all your new knowledge and now you have some pretty decent photos to show for it. Your friends have all looked at them and say they're great and one or two really are quite good, what are you going to do with them now? Just let them languish on your hard drive? Print a few out and stick them in a drawer? Maybe frame a couple and hang them on the wall but there isn't room for very many.
When you take a picture with your camera set on Auto mode, you are delegating responsibility for determining the correct exposure to the camera. Depending on the 'brain' (or programmed chip) inside your camera, the result may be pleasing or not to your satisfaction. But before you blame the camera for your lousy pictures, it pays to understand a bit what goes on behind the scenes when you press the shutter release button. In this tutorial, we are going to look at what 'correct exposure' means.
One of the major difference between a consumer digital camera and a digital Single Lens Reflex (DSLR) is that the former produces images with a lot of noise when using high ISOs and long exposure times, and the latter is practically noise-free (though high ISO performance varies depending on camera manufacturer and model). Noise is apparent by the presence of color speckles where there should be none. For example, instead of a blue sky, you notice faint pink, purple and other color speckles amongst the otherwise blue sky.