This time we familiarize you with certain terms used with photography in general and digital cameras in particular. Digital Camera Terms and Definitions Aperture Variable diameter opening built into a lens, which controls light intensity. Dividing the focal length of a lens by any f- stop gives its aperture diameter. The higher the number the smaller the lens opening and the less light that is let into the lens. The smaller the number, the larger the opening and more light enters the lens.
Aperture helps control exposure of the image.
The camera sets the focus for any subject in the center of the viewfinder frame, and a motor moves the lens forward and backward to focus on the subject when the shutter button is pressed. Allows you great flexibility and control over particular areas of a scene. Automatic focus with focus lock lets you focus on a particular subject then move it off-center. The temperature an object that doesn't reflect any light would have to be heated to in order to produce a given color. When a lens is focused on a specific object, there is a range of acceptable focus extending behind and in front of it.