Q - I would like to know the steps in making a doubl e exposure with a 35mm camera. A - There are two ways to make double exposures of transparencies. One is in your camera and the other is by recopying two slides by placing one on top of the other.
o make a double exposure in your camera you need a feature on it that will let you set the shutter release without advancing the film. on some models all you have to do is to push in the rewind button on the bottom and recock the shutter without engaging the film advance mechanism. On others you can set the ring around your shutter button to R(rewind) and rewind the film one full turn (for this, maks a pencil mark on the button and the ring edge so that you have a reference maThen, after you've rewound the film back into the cassette, set the film advance to A and recock the shutter to make another shot over the previous picture.
The easiest way to make a double exposure is by recopying two transparencies, if in color, or projecting two different negatives on the same piece of paper, if it is in black and white.
The advantage of the recopying and projection method over shooting in the camera is that you can see the effect that you're getting whereas camera technique calls for pre-planning of the position of the image and the right amount of exposure on each picture so that the two images will complament, not cancel out,each other.
A rule of thumb for making a double exposure on color transparencies is to overexpose each one stop. The reverse is true for neagative color and black and white: under-expose each one stop.