A "multiple exposure" means that two or more exposures are made on the same frame of film. There are various reasons why multiple exposures are taken. Generally, people will reduce each exposure by half to arrive at a single exposure's exposure value. Others lay down 1/3 + 1/3, believing that the pre-sensitized film is more receptive to light, thus 1/3 +1/3 = 1. I think they are both right, depending on the scene. Here are a few reasons for multiple exposures, with examples:
Individual exposures of different scenes (may be difficult to place elements of successive images) - night shot of cityscape with a moon added later.
Same scene with elements added or changed for the second exposure - at night outdoors with electronic flash, insert person on second shot - expose each for half. Person's shadow may be slightly visible in second shot, but they will look "ghostly".
Same scene twice, once out of focus, once in focus. I have seen examples of the surrealism one can create, but the degree of being out of focus and portion of the exposure value I cannot remember. Experiment and take notes or Google something.
Three stops down exposure of an out of focus 18% neutral gray card, then a minus 1/3 exposure of a high contrast scene. You can make a subtle yet significant reduction in contrast on transparency (slide) film. For example, flowers in the bright sunlight spattered shade of trees. The -1/3 should keep the "sun spots" from blowing out, while the pre-exposure raises shadow detail because the film has been "woken up" as I put it. I've always believed my camera bag is the gray it is for a reason...I have used it for this purpose, substituting it for a gray card.
Now for the bad. Multiple exposures occur when you rewind the film, don't rewind all the way into the container, then load it normally at a later date and use it again.
If your film camera has a multiple exposure lever to prevent film transport, any of these are relatively easy to manipulate. Otherwise, you have to advance to set the shutter then depress the film transport button on the bottom of the camera and rewind a specified amount. Your camera manual may indicate how much, but it's a real hit-and-miss proposition if accurate registration is needed for the second shot but I have done it.
Multiple-exposure photography.
To determine the proper exposure when making prints. Test strips allow you to determine the tonal range of the print at multiple levels of exposure.
Catalog photography is a type of commercial photography that is published for pubic viewing in a catalog. Digital Photography is a good way to make photography accesible for catalogs. As an instant media form, photographs for catalogs can be made cheaply and modified more effectively for use in a catalog.
emphasizes the point of an object
Careful exposure and development of the negative. (Zone system)
Multiple-exposure photography.
To determine the proper exposure when making prints. Test strips allow you to determine the tonal range of the print at multiple levels of exposure.
Bryan Peterson has written: 'Understanding exposure' -- subject(s): Photography, Exposure 'Bryan Peterson's understanding photography field guide' -- subject(s): Photography, Handbooks, manuals
George L. Wakefield has written: 'Synchro-flash photography' 'Exposure control in enlarging' -- subject(s): Enlarging, Exposure, Photography 'Camera movements' -- subject(s): Photography
Bryan F. Peterson has written: 'People in focus' -- subject(s): Portrait photography 'Learning to see creatively' -- subject(s): Artistic Photography, Composition (Photography) 'Understanding exposure' -- subject(s): Exposure, Photography
take off your clothes to gain exposure
Step-by-Step instructional books on long-exposure photography can be found in community libraries. If your local branch does not carry the book you need, most libraries can help you to locate one. Contacting someone in the photography field would also be helpful in finding information o long-exposure photography.
A building.
The modern definition of photography is the process of producing images. This also includes, the process of taking or producing a photo.
You can find examples of double exposure photography online at the Images section of the Google website. Once on the page, type "Double exposure photography" into the search field at the top of the page and press enter, then click on "Images" at the top of the page to bring up the example images.
Frank Morris Steadman has written: 'Steadman's complete exposure method and home portrait helps' -- subject(s): Exposure, Photography, Portrait photography
The depth of field(focus) and exposure.