Topic 1: Terms
Topic 2: Understanding exposure
Exposure is the total amount of light allowed to fall on the photographic medium. It is comprised of three major elements called the Exposure Triangle: ISO, Aperature, and Shutter Speed.
ISO – the setting that measures the camera’s sensitivity to light. The common span of ISO speed is 100 to 800. The higher the ISO speed the faster the camera collects light but it also adds more noise to the photograph than the lower speeds.
Aperture – measures how big the shutter opening will be
Shutter Speed – is the measurement of how long the shutter will be open
The Window metephor i found at ttp://www.digital-photography-school.com/learning-exposure-in-digital-photography#ixzz13mYA5Fhg offers a simple explanation.
Imagine your camera is like a window with shutters that open and close.
Aperture is the size of the window. If it’s bigger more light gets through and the room is brighter.
Shutter Speed is the amount of time that the shutters of the window are open. The longer you leave them open the more that comes in.
Now imagine that you’re inside the room and are wearing sunglasses (hopefully this isn’t too much of a stretch). Your eyes become desensitized to the light that comes in (it’s like a low ISO).
There are a number of ways of increasing the amount of light in the room (or at least how much it seems that there is. You could increase the time that the shutters are open (decrease shutter speed), you could increase the size of the window (increase aperture) or you could take off your sunglasses (make the ISO larger).
Topic 3: Aperture and depth of field
Aperture is the measurement of the opening of the camera lens. When the opening is wide, more light comes int, when its small, less light comes in. It is measured using F-stops. Here is an article with a simple explination found on another wordpress blog http://zoomyummy.com/2010/07/28/gosh-whats-aperture/.
Depth of field is the amount of space before and beyond your focus point (subject). Try this, hold your had at arm’s length in front of your face with your palm facing you. Focus on your hand, notice how you can clearly see all the images around you. Now move your hand halfway towards your face, and focus on your hand again. Notcie how the surrounding become more blury the closer it gets. Continure moving your had towards your face until it is as close as your eyes can focus on it. Very little of the area surrounding your hand remains in focus.
Assignments and Articles
Read 10 tips for great pictures at Kodak.
Read Digital Camera Controls
Read article on pixels and resolution.
Read this discussion about the focal length of lenses