• Variable opening that controls the amount of light that passes through the camera lens. Apertures values are measured in f stops, where the higher the “f” number the smaller the physical apertures. The aperture also has a direct result on the depth of focus or how much of the picture will be in focus. Wide apertures (such as f2.8) allow the camera to receive a lot of light but result in a narrow depth of focus.

Shutter Speed

  • A measurement of how long its shutter remains open as the picture is taken. The slower the shutter speed, the longer the exposure time. When the shutter speed is set to 1/125 or simply 125, this means that the shutter will be open for exactly 1/125th of one second. The shutter speed and aperture together control the total amount of light reaching the sensor. Some digital cameras have a shutter priority mode that allows you to set the shutter speed to your liking.

Macro Photography

  • A kind of close-up photography. The classical definition is photography in which the image on film is at least as large as the subject. Therefore, on 35mm film (for example), the camera has to have the ability to focus on an area at least as small as 24×36 mm, as this is the size of the image on the film. This is a magnification of 1:1.


  • Depth of Field
  • This is a visual effect done to simulate the way that real-life cameras will focus on objects in the foreground; the view behind such things will always be out of focus or slightly “blurry”. There are various ways that this can be done such as using an accumulation buffer or pixel shader routines, but it requires very powerful graphics adapters to do this in real-time and quickly.
  • This is how far the object can move towards or away from the lens while still maintaining acceptable image quality. The trick is in defining “acceptable.” It really does depend on what results you are trying to achieve. We hope to make your work easier by using two different depth of field specifications that will be defined below. Honest, more is easier in this case.


  • (White Balance) — A way of calibrating a camera’s color response to take into account different color temperatures of light (ie, fluorescent light is greenish; sunlight, more blue; incandescent light, yellowish). This calibration allows the camera to define what the color white is under any of these various lighting conditions. Failure to white balance could result in an unsightly, unnatural color cast.


  • Refers to a metering system that utilizes a light-sensitive mechanism within the camera body to measure exposure from image light passing through the lens. TTL viewfinders reveal exactly what the lens sees, avoiding parallax problems. TTL Systems can also provide exposure information directly to an external flash and the flash automatically adjusts the light output to provide the best exposure.


  • Point of Interest.


  • A photography technique in which the camera follows a moving subject. Done correctly, the subject is sharp and clear, while the background is blurred, giving a sense of motion to the photo.


  • (Digital Single Lens Reflex) cameras are SLR cameras which use digital recording media.

Point and Shoot

  • A point and shoot camera offers few or no manual controls and very simple operation. Focus, exposure, and most other adjustments are completely automatic; all the owner needs to do is aim and push the shutter button. Most advanced cameras also have point and shoot modes.


  • (Exposure Value) — Developed in order to simplify numbers used in exposure calculations. Currently used to describe the range of exposure in which equipment can successfully operate.


  • (In My Humble Opinion) — A shorthand appended to a comment written in an online forum, IMHO indicates that the writer is aware that they are expressing a debatable view, probably on a subject already under discussion. One of may such shorthands in common use online, especially in discussion forums.