How to take better pics in front of your Christmas tree.-- Use the Av mode (set it to the smallest number) and turn off your flash. Every year I try to take pics of my family or pets in front of the tree and they always turn out funny, now I know!
Trick, Photography Book - It shows aperture because at some apertures some things are in focus and some arent - Now YOU Can Create Mind-Blowing Artistic Images With Top Secret Photography Tutorials With Step-By-Step Instructions!
This charts show the effect of aperture on the size of the starbursts. As you can see, the smaller the aperture, the more emphasized the starburst. The same concepts apply during the daytime as they do during the night time.
Photography Cheat Sheet: how much your camera captures at every lens' focal length by margarita