Most expensive digital cameras have many megapixels. These indicate the maximum size of the photo you can get.
In most cases, digital cameras have different features that will determine their performance. For example, the focal length is important. It is measured in millimeters and shows us the breadth of vision that allows the camera lens. The smaller the focal length, the wider the result! For example a 15mm lens allows you to view 180 ° while a 600mm gives you a view of 4.25 °. If you take pictures in very tight spaces and want to cover more space in your decision, you should look for cameras with a short focal length. To these are called wide angle lenses.
Opening the Aperture
The digital cameras aperture is an opening in the lens that regulates the amount of light entering the interior. If you take a picture in a very sunny, the diaphragm must be very closed to keep out too much light and the photo is overexposed (too shiny), however if you take a photo in low light, the opening should be maximum to let in more light and the picture will not go dark.
Openness also lets you manage depth of field shooting. This means you can focus on a goal to come out sharp and the background can be blurry. Here the thing is a bit confusing but you get used to the time, and that greater openness has a smaller f value and vice versa. A larger aperture lenses with fast lenses and tell them you are able to take photos in low light.
Shutter speed
The digital cameras shutter speed is the time it takes to open and close the shutter. The shutter is the mechanism that lets light into the camera. If you take pictures of fast moving targets such as sports, it is important to use a high shutter speed so that the image is as frozen in time, because if the speed is very slow, the picture may become blurred. In the shots at night is important image is properly exposed. Shutter speed is measured in seconds and fractions of a second.
The ISO is a measure of sensitivity to light that digital cameras can reach. A high ISO lets you capture a picture in low light conditions, but in return the picture may get a little porous (as filled dots) for a defect called? There are cameras that can capture photos at high ISO and still have great image quality. This is important when taking pictures in low light, to make the shot with a shutter speed high enough for the picture will not blur, which is what usually happens when we take photos without flash in dark places.
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