Photography Aperture and f/stops: the aperture is an opening in the centre of the lens through which light passes. The amount of light which passes through an aperture is indicated by f/stops. The lower the f/stop the more light that passes through the aperture. Opening up one full f/stop doubles the amount of light entering the camera. F/4 admits twice the light of f5.6.

Photography Depth-of -field: The distance from the front to back that is in reasonable sharp focus is called the depth-of-field. There are two ways of controlling depth-of-field: Use a small aperture or focus on a point farther away from your camera.

Photography ISO (ASA): stands for International Standards Organisation. The initials are used for film speed which rates light sensitivity. A film with an ISO number 100 is twice as light sensitive as a film with an ISO of 50. The faster the film, the more sensitive it is to light.

Image resolution: Photography resolution is a measurement of image quality, so you may define resolution by how much detail is in your print. If your print has sharp detail you may consider your image to be of good resolution. If detail is blur in your image you may consider your image to have poor resolution. Good resolution is a direct result of having a large number of pixels in an image.

Pixels explained: Digital images are made up of millions of small dots - each dot is called a pixel. Each dot contains a small piece of image information, and when added together with the other pixels you’ll get your final image.

SHUTTER: The shutter is a mechanical device that controls the length of time that light is allowed to act on the film. Most standard cameras allow us to use a range between 16 second and 1/1000 second. Using a shutter speed of 1/125 second should safely avoid overall blur due to camera movement if you hold the camera by hand. Any longer shutter time should require a tripod.

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