Appendixes 122GlossaryFlashA speed light that helps to create adequate exposure in low-lightconditions.Focal lengthThe distance from the middle of the lens to its focal point (inmillimeters). Longer focal lengths result in narrower angles of viewand the subject is magnified. Shorter focal lengths result in widerangles of view.Image sensorThe physical part of a digital camera that contains a photosite foreach pixel in the image. Each photosite records the brightness ofthe light that strikes it during an exposure. Common sensor typesare CCD (Charge-coupled Device) and CMOS (ComplementaryMetal Oxide Semiconductor).ISO sensitivityThe sensitivity of the camera to light, based on the equivalent filmspeed used in a film camera. At higher ISO sensitivity settings,the camera uses a higher shutter speed, which can reduce blurcaused by camera shake and low light. However, images withhigh sensitivity are more susceptible to noise.DPOF (Digital Print Order Format)A format for writing printing information, such as selected imagesand number of prints, on a memory card. DPOF-compatibleprinters, sometimes available at photo shops, can read theinformation from the card for convenient printing.EV (Exposure Value)All the combinations of the camera’s shutter speed and lensaperture that result in the same exposure.EV CompensationThis feature allows you to quickly adjust the exposure valuemeasured by the camera, in limited increments, to improve theexposure of your photos. Set the EV compensation to -1.0 EV toadjust the value one step darker and 1.0 EV to one step brighter.Exif (Exchangeable Image File Format)A specification to define an image file format for digital camerascreated by the Japan Electronic Industries DevelopmentAssociation (JEIDA).ExposureThe amount of light allowed to reach the camera’s sensor.Exposure is controlled by a combination of the shutter speed, theaperture value, and ISO sensitivity.
