Key element in photography is light, without light, will not happen of a picture and in the capture of the DSLR camera is an important factor that must be considered, namely:

1. shutter speed
2. Aperture / diaphragm opening
3. iso / asa

These three factors above, the shutter speed + aperture + iso = expossure.

Expossure (lighting) = is the quantity of light allowed to enter, the intensity (set by opening the lens) and duration (governed by the shutter speed) the light coming in and the image sensor. High iso, need a bit of light to produce clear images. conversely, low-iso require a lot of light to produce clear images. * remember: the high iso images may cause the results arising noise that can reduce image quality.

Shutter speed (to shut = closed) = at the time we hit the button for taking pictures, going the opening so that light entered the lens and the image sensor. work shutter is opened and then closed again. Shutter speed is the speed of the shutter opened and closed again. Shutter speed can be set. If we choose 1 / 100, then it will open for 1 / 100 sec. Scale varies shutter speed.

There are B, 1, ½, ¼, 1 / 8, 1 / 15, 1 / 30, 1 / 60, 1 / 125, 1 / 250, 1 / 500, 1 / 1000, ff. ranging from ½ to 1 / 1000 usually just called the numbers below it, meaning 100 = 1 / 100 and 2 ½ seconds means. But if the number is 2-colored, it means 2 seconds, while B the mean is bulb , ie, if the button is pressed the shutter opens, and when the shutter release button to close, to remember is, the longer the shutter speed, the amount of light entering the more much. the greater the number, then the shutter speed will be higher (the faster the shutter open and closed).

Diaphragm or aperture (or often called exposure) = function to regulate the amount of light entering the volume, this function is usually in the back of the lens, consisting of 5-8, composed of metal plates and can open wider or narrower. Writing numbers diaphragm usually is f / 2, f/2.8, f / 4, f/5.6, f / 8, f/11, and f/16, and so on. The smaller the number the diaphragm, then the resulting openings will be widened so that the light coming in more and more. Tips:

1. Large opening = large diaphragm opening (small f number) is used to produce images with sharp subject with background blur.
2. Small opening = opening a small (large f number) will produce a sharp image from foreground to background. Small openings are usually used in landscape, needed detail and sharpness on the image.

iso = iso values in the digital photography states that the sensitivity of the sensors used in digital cameras. Use the lowest iso value for the best photo. If the shutter and diaphragm settings still can not get the right exposure (usually in low light conditions) then it could try to raise the value iso.
In addition to shooting at low light, use a high iso is well suited to prevent hand-shake blur effect (if the camera does not feature stabilizer) or for high-speed photography, because it allows the use of high iso. Raise the value of iso will make a side effect of noise on the image.