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For newbies, if some of the camera settings are still new to you and you do not understand that then follow reading, because this article intended to inform enough so you understand aperture.

Aperture is measured in f numbers, or more commonly called f-stops. Change the value of the aperture by an increase or double or half the amount of light entering the camera. There may also be 1/3rd increments but we will not go into that now. Fast lenses can begin to f1.2, this means that the higher f stop these lenses f1.2 achievable allow shooting at shutter speeds faster due to the amount of light that the camera sensor. The lens starts this range also will give a depth of field when used at this wide aperture. This means that if you want you are subject to be in focus but the background out of focus and then using a large aperture of f1.2 will make this possible. There are other ways to do this, but the choice of a wide aperture will help. On the other hand with a greater depth of field, such as f11 or f16 will allow greater depth of field, this will allow more of the image of being in the approach and this technique is used usually by landscape photographers. Using an aperture of this size will be less light the shutter speed to tend to be longer and if you are looking to take landscape photos you may want to invest in a decent tripod.

Thanks: On camera