Instructions
Using a Digital SLR
Access your DSLR's control menu by pressing the "MENU" button on the back of the camera.
Locate the multiple exposure setting, usually represented by an icon of two over-lappping frames. Select this option by pressing "OK" on your camera's control pad.
Look through the viewfinder and compose your image as desired. Depress the shutter button to automatically focus on your subject and take the picture.
Decrease the exposure compensation by half, using the rotating adjustment dial on the hand grip of your camera. Check the exposure indicator in your viewfinder to ensure that your exposure is less than it would normally be for the same shot.
Compose your image and depress the shutter button to make your second exposure. Preview the image using the LCD screen on the back of the camera.
Using a Manual Film SLR
Look through the viewfinder and compose your image as desired. Depress the shutter button to take the picture.
Press and hold the film rewind button on the underside of the camera with your thumb. Hold the film rewind knob, located on the top left of the camera, firmly in place with your pointer finger.
Advance the film slowly to cock the shutter without proceeding to the next frame. Release the film rewind button and knob. Decrease your exposure by increasing shutter speed or stopping down your lens opening.
Look through the viewfinder and compose your second exposure. Depress the shutter button to take the picture.
Advance the film forward as normal.