what does ISO, Aperture, Shutterspeed do ?

Question by Somekidwithasianeyes: what does ISO, Aperture, Shutterspeed do ?
I have nikond3100
how can i apply them correctly ?
when should i use high or low ISO, aperture, shutterspeed ?

Best answer:

Answer by klah
This site has all the information you’ll need.


Know better? Leave your own answer in the comments!

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4 Responses to what does ISO, Aperture, Shutterspeed do ?

  1. Freelance Photography By Angela Lee Watson says:

    Nikons website should have some useful information on camera settings etc. You may also want to get a book on your camera. Canon’s for Dummies books have a lot of helpful information. Which includes some suggested settings to use. They should have a Nikon D3100 for Dummies.

    Good Luck

  2. fhotoace says:

    You can learn this and practice using those three components of exposure here


  3. injanier says:

    You’ve been directed to a number of sites with good, detailed information on selecting the proper exposure settings, but I’ll attempt a brief summary.

    ISO determines the sensitivity of your camera – higher ISO means higher sensitivity to light, so you can use smaller apertures and/or faster shutter speeds. As a side effect though, higher ISO will also give you more noise, which shows up as little flecks of random color throughout the image. This might be especially conspicuous in the dark areas of the picture.

    Faster shutter speeds are better for stopping action; longer shutter speeds let in more light and let you select smaller apertures and/or lower ISO. Too slow a shutter speed will show motion blur in moving objects or overall blur due to camera shake. Shutter speeds is generally in fractions of a second, though it can be whole seconds in dim light. For that you definitely need a tripod.

    Aperture is the amount of opening of the lens. It’s expressed as a fraction of the focal length, because that results in the same amount of light reaching the sensor regardless of the lens. f/4 means the aperture is 1/4 the focal length. Because this number is a fraction, a larger number means a smaller aperture and less light. Large aperture (small f-number) gives shallow depth of field, with only a narrow range of distance in focus, and requires very precise focusing to get a good image. The advantage to it is that you can emphasize your subject by having everything else out of focus. You can use your depth-of-field preview button to see the effect. A large aperture also lets in lots of light, which is useful in low-light situations.

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