First of all, lets talk exposure and what it is. Exposure is the result of a certain amount of light that is able to remain on the cameras sensor for a certain period of time. Of course there are certain factors that will determine the amount of light, such as ISO, the speed of your shutter, and the aperture in which you are shooting. Due to the advancements in digital cameras and their processors, it is no longer necessary to acheive the 'correct exposure.' You may take a photo on 'auto mode,' but the final product is not what you have intended. To acheive the effect you want, you may want to drop or raise the exposure, depending on your ISO, aperture, and shutter speed. Also using a flash can be helpful, or it may be your worst enemy. Experiment with different settings to acheive the effect you want. Photography is fun, enjoyable, and creates a moment in time that you can cherish forever.
Below are some examples of exposure using my Canon PowerShot ELPH 100 HS 12.1 MP CMOS Digital Camera with 4X Optical Zoom (Grey) , point and shoot camera. Post processing was done on my Apple iPad 2 Tablet (16GB, Wifi,) NEWEST MODEL. All the pictures were taken at night, dropping the exposure down 2 full stops to create a black background, and using the built-in flash.
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link the photo back to http://www.tesarphoto.blogspot.com