168Appendix > GlossaryFlashA speed light that helps to create adequate exposure in low-lightconditions.Focal lengthThe distance from the middle of the lens to its focal point(in millimeters).Longer focal lengths result in narrower angles of view and the subject ismagnified. Shorter focal lengths result in wider angles of view.HistogramA graphical representation of the brightness of an image. The horizontalaxis represents the brightness and the vertical axis represents thenumber of pixels. High points at the left (too dark) and right (too bright)on the histogram indicate a photo that is improperly exposed.EV (Exposure Value)All the combinations of the camera’s shutter speed and lens aperturethat result in the same exposure.EV CompensationThis feature allows you to quickly adjust the exposure value measuredby the camera, in limited increments, to improve the exposure of yourphotos.Exif (Exchangeable Image File Format)A specification to define an image file format for digital cameras createdby the Japan Electronic Industries Development Association (JEIDA).ExposureThe amount of light allowed to reach the camera’s sensor. Exposure iscontrolled by a combination of the shutter speed, the aperture value,and ISO sensitivity.
