b shutter speed?

Question by georgia_1234567890: b shutter speed?
hey what is the B shutter speed?

whenever i am wanting to take a photo that doesn’t have enough light, i go for the B shutter speed, yet my negative always turns out over-exposed (“black” negative, therefore a “white” photo)

how do i avoid this? my camera only goes up to 2 seconds, and i feel the B shutter is my only option for low-level light photography
sorry, but i dont really understand the “logic” behind the b-shutter speed.
how can I be sure that say, 30 seconds will produce a good image, to say 5 seconds? without overexposing any of them.
i dont understand how to not over-expose with the B shutter speed.
PS: what is a cable release? ill be sure to use a tripod

Best answer:

Answer by frivologs
if it goes up to 2 seconds, you should time (with your watch, a timer, etc.) how long you want to expose for exposures greater than 2 seconds. With proper exposure, even using B, you should be able to get good pics. Trial and error is the way to go. After you attempts, you will find out what might be the right exposure. Of course, if you don’t have any aids (light/exposure meter) you will bracket–take a few shots that you think are underexposed and a few you think are overexposed then check out the results.

What do you think? Answer below!

Tennessee v. John T. Scopes Trial: Dayton, Tennessee

Image by Smithsonian Institution
Description: Taken the month before the Tennessee v. John T. Scopes Trial. June 1925

Creator/Photographer: Watson Davis

Medium: Black and white photographic print

Dimensions: 3 in x 4.25 in

Culture: American

Geography: USA

Date: 1925

Persistent URL: http://photography.si.edu/SearchImage.aspx?id=5296

Repository: Smithsonian Institution Archives

Collection: Tennessee v. John Thomas Scopes Trial Photographs – During 1925, Watson Davis (1896-1967), Science Service managing editor, took numerous photographs while covering the State of Tennessee v. John Thomas Scopes trial as a reporter. In what was dubbed "The Trial of the Century," Scopes was tried and convicted for violating a state law prohibiting the teaching of the theory of evolution. William Jennings Bryan served on the prosecution team, and Clarence Darrow defended Scopes. Almost eighty years later, the nitrate negatives, including portraits of trial participants, and images from the trial itself and significant places in Dayton, were discovered in archival material donated to the Smithsonian by Science Service in 1971. Marcel C. LaFollette, an independent scholar, historian and Smithsonian volunteer uncovered these rare, previously unpublished photographs of the 1925 Tennessee vs. John Scopes "Monkey Trial" in the Smithsonian Institution Archives (SIA). In 2005, SIA restored fifty-two of the negatives with funds granted by the Smithsonian Women’s Committee. Included here are thirty-nine of the images. All images belong to the Record Unit 7091: Science Service, Records, 1902-1965 collection of SIA. All photographs were taken by Watson Davis, Managing Editor of Science Service, while he was in Dayton, Tennessee, June 4-5, 1925, and July 10-22, 1925. LaFollette identified and dated each of these images, and has published a new book highlighting these and other images from the trial entitled, Reframing Scopes: Journalists, Scientists, and Lost Photographs from the Trial of the Century, University Press of Kansas, 2008.

Accession number: SIA2008-1124

Photo Shop cs5 how to make the background black an white

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23 thoughts on “b shutter speed?”

  1. your B setting on your camera stands for “bulb”. what that setting does, is it holds your iris open as long as it is held. to take any exposures longer than around 1/60 of a second you should use a cable release and a tripod. a hand held exposure meter is handy also. if you don’t have one, it might be an idea to get one. esp. if you do a lot of low light stuff.

  2. Bulb is a shutter-speed setting on an adjustable camera that allows for long exposures under user control. When set on “B”, the shutter will stay open as long as the shutter release button remains depressed. The “T”, or Time, setting, on the other hand, requires one press to open the shutter and a second press to close it. Here is an article which explains it http://en.wikipedia.org/wiki/Bulb_%28photography%29
    Regarding how to do night photography here is another article you may want to read. In regards how to do proper night photography your best choice is to get yourself a good handheld light meter or learn how to bracket your exposures.
    http://en.wikipedia.org/wiki/Night_photography

  3. try changing the aperture to a smaller value(i mean a larger number) .. or try increasing the aperture and use the 2sec shutter speed .. or u can use films like 400,800 ASA for low light photography

  4. IF your camera only goes to 2 seconds, and you want to use the “B” setting, as suggested above, you would need some time device (a wrist watch, for example with a seconds hand or digital numbers). The best way would be to use your judgment, which you will greatly improve with practice (known as experience). Since your camera setting only goes to 2 seconds, then you would do several exposures, 3 seconds, 4 seconds, 5 seconds, 5 seconds… and that way you’ll have an idea of how long to leave the shutter open as you gain experience.

    A cable release is nothing more than an encased cable that screws into the cable button’s screw opening and it is pliable so that when you squeeze it, the movement is absorbed by the flexible cable and will not transfer the movement to the camera and cause camera shake; it comes in different size from a few inches long to about 24 inches long, get one that you can afford; they are not very expensive and will serve you well.

    A sturdy tripod is indeed a vital tool to use for those long exposure-photos to hold the camera steady as the image is being exposed but you don’t really need to spend a fortune on one unless you are going to be using it everyday and for traveling to exotic jungles and/or desserts and/or rain forests with a very expensive pro-level camera; consider the Sunpak 6601 UT for $ 28; Sunpak 700aDX Digital for $ 30; Sunpak 9002DX for $ 45; Ultra 757 for $ 80; Velbon Cx-470 for $ 30; Velbon Videomate 607 for $ 70); check with http://www.bhphotovideo.com and see what you can afford. Good luck and best wishes.

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