The number assigned to a particular lens aperture (or opening) size.
Fringing
This occurs when a digital image is artificially sharpened. The term usually refers to a white fringe that is apparent on the edges of objects in the picture. Fringing can also occur as a result of compression.
Focus
To adjust the distance between the lens and an image to make the image as sharp as possible.
Focal length
The distance from the rear model plane of a lens to the focus when the lens is focused at the infinity position.
Flash
An electronic device that produces a burst of light the consumer can use to produce more exposure on the film.
Film speed
The film's sensitivity to light. For example, an ISO 100 film requires twice as much light as an ISO 200 film.
Film processing
The process where chemicals remove the unexposed silver on the film, then fix or stop the developing process and stop the negative's sensitivity to light. Now with PowerShot digital cameras, you are freed from the expense of film buying and processing.
Film
A piece of plastic with a light sensitive mixture spread on it.
File format
The way an image is saved to a digital camera's memory. The . JPEG format that PowerShot cameras store digital images as is fast becoming an industry standard.
