I'm new to the hobby...so this might be dumb question to ask. The auto-focus points...how important are they? THere are two different cameras im looking to buy, one has only 3 and the other i believe has 5. Some of the pictures I see on this sight have areas that are blurred and then area that is really focused...and I like that look. Is the number of points that you can focus, whats doing this effect? Any insight on this would be greatly appreciated!