1. SLR - stands for single-lens reflex. This is a camera that uses mirror and prism system. 2. TLR - stands for twin-lens reflex. It is a camera that has two objective lenses of the same focallenght and the other lens view the objective and reflected in a consists of a 45-degree with a mirror. 3. Lens - A transparent optical device use to converge or diverge transmitted light to form an image 4. Shutter - a device that allows light to pass for a determined period of time and capture a image of a scene that you wish to be taken. 5. Shutter speed control - exposing photographic film or a light-sensitive electronic sensor to light and to capture the permanet image of the scene you wish to take 6. Aperture - hole or an opening through which light travels 7. ASA/ISO/Film Speed - the speed of film or camera responces to light 8. ASA/ISO Dial -a dial used on digital cameras to change the camera's mode 9. Shutter Button - the button use to take pictures 10. Rewind Knob - the button on top of the camera for rewinding the film back in to a cassette after the film is exposed 11. Self Timer - delay between pressing the shutter release 12. Counter -the devise for recording the number of film famees exposed 13. Hot shoe - a mounting point on the top of a camera to attach a flash unit 14. Depth of Field Scale -its makes the picture sharper or blurry 15. Film Rewind Button - unlocks the shutter interlock and allows you to rewind the film back into its original canister