Taking a Digital Photograph, Say Cheese!
As a quick overview, what happens when you press the shutter button is as approximately follows, depending on the make and model of the digital camera you have:
1. The auto-focus system measures the distance to the subject, projecting a guide light
2. Small circuit board-controlled motors move the lens in and out (zoom) to focus on the subject
3. The amount and kind of light entering the lens is measured, white balance is set
4. The aperture opening or f-stop is set
5. The shutter speed is set to correspond to the f-stop and ISO setting
6. The electronic shutter opens and closes at the speed set by the camera's central processor
7. The digital image is recorded by a digital sensor array
8. The image is recorded to a storage device
9. The stored image is displayed on an LCD viewing screen
10. The camera battery or power system capacitors recharge (this is when the screen goes blank)
11. Fully recharged, the camera displays the current image on the LCD viewing screen
12. The camera is again “re-set" to a neutral mode, ready for the next operation
Now we can briefly discuss some of these elements in a bit more detail.