Afocal Teleconverters for Fixed Lens Cameras

Front Lens Converter Diagram

Small cameras and less-expensive cameras usually do not have interchangeable lenses. Therefore, telephoto and wide-angle attachments for these cameras must be attached in front of the camera lens. This is analogous to using a fixed-lens camera to take photos through the eyepiece of a telescope, thus replacing the human eye with a camera. For this to work with any camera lens, an afocal arrangement shown in Figure 12.8 is required. The magnification in this arrangement is given by m f feS camera...