Lens/Pentaprism

• A 35mm camera has single-lens reflex (SLR) to help focus in on the image. This lens can be adjusted to bring the image into view, making it smaller or larger. The lens is a bent piece of glass that allows the beams of light to bounce from the object and then be recaptured on the film in the camera to form an image.
  The pentaprism is located inside the lens. It is a prism mirror that helps avert beams of light within a 90 degree angle.
  
  

Shutter

• The shutter protects the lens when the camera is not in use. This shutter opens up automatically when the camera is turned on.
  
  

Flash

• The flash, which is built directly into a 35mm camera today, is there to give extra lighting, so that the image can be captured more clearly. Flashes are mainly used indoors where the lighting is not as good or outdoors when it is cloudy or nearing dusk.
  
  

Viewfinder and Focusing Ring

• The viewfinder is a little window built inside the camera where you look through to find and focus in on the image that you want to shoot. The focusing ring helps to bring the image into focus, giving you a clear picture of the image. The focusing ring allows the lens to move back and forth so that this clear picture can be obtained.
  
  

Film

• The film is placed inside the camera and is set by an ISO indicator, which sets the speed of the film. The lower the speed of film, the more light it takes to capture a clear image. The film moves from frame to frame by a film advancer lever. Some advancer levers are manual, which are located on the outside of the camera, and some are built in, and auotmatically move the film from frame to frame.
  
  

Rewind Release

• The rewind release is an automated system that rewinds the film within the camera, once it has been used, protecting it from the light before it it taken out of the camera.