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How To Make Proper Use of Lens Apertures
The diameters of all digital SLR camera lenses are controlled by a metal-bladed iris. The size of the iris can be regulated by the image taker using the standard aperture range, which begins at 1 - the biggest diameter - and gradually becomes smaller on a logarithmic scale that is based on the square root of two.
The idea is to make use of an aperture with a shutter speed that yields the right exposure. Luckily, with today's digital SLR cameras all you have to do is to decide on the relevant aperture size and the camera's electronics can decide on the right shutter speed to produce the appropriate exposure.
This will occur on a digital SLR camera that is set to aperture priority mode. If you aspire to become creative you can put your digital SLR camera in manual mode and simply select the required aperture and the shutter speed. But you have to be careful here by selecting the shutter speed first, and then decide on the aperture. If you do it the other way around, it might not work.
You have to understand that when choosing sizeable apertures you will generally obtain photographs that have a minimal depth-of-field. This means that the background, and at times the foreground of a subject, will not be in focus. This effect is superb for portraits and when you do not want any distraction in a scene.
If you require more of the photograph to be in focus you will have to go for a smaller aperture. Unfortunately, a smaller aperture will mean less light entering the lens and thus the shutter speed will be by design reduced to preserve a reasonable exposure.
A longer shutter speed means that there is greater risk of experiencing camera shake, which can lead to blurring. It is a delicate balancing act actually. You either reduce the depth-of-field to acquire the desirable exposure, or you experience blurring because there is insufficient light.
Nevertheless, there is a smart way to circumvent this drawback. In order to lessen the probability of image blurring, all you have to do is to put your camera on a bean bag or a tripod, then utilize a remote release cable or the camera's self-timer to minimize unwanted camera movement, and that is all there is to it.
Lens apertures are actually ratios of the lens's focal length and are given as f/numbers, like f/3.5, f/8, f/22, etc. These are also referred to as f/stops, or simply stops. The bigger the f/number, the smaller is the aperture. So an aperture of f/20 is considerably smaller than one of f/3.5.
About the Author
Chris Smith gives photography tips in his weekly ezine, which you can obtain for no cost. He has also put together a complementary report for you called How To Master White Balance, which can help you solve any white balance problems that you may encounter. To download it instantly and to obtain the ezine please visit: http://photography-expert.com
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