Converter
What Does Converter Mean When Talking About Photography? A converter, also referred to as a tele-converter or extender is a secondary lens which can be mounted between a camera and main lens. The purpose of a converter is to magnify the central portion of a lenses image area, therefore increasing the focal length. Typically converters come in either 1.4 or 2.0 magnification factors. When using an extender the shooter will sacrifice a small amount of lens speed (-1 stop for 1.4 and -2 stops for 2.0) and autofocus performance will also reduce slightly. Extenders also magnify any distortion caused by …