Digital Photography Technology

Camera focusing is what any camera has to do before taking a picture. Some of the inexpensive cameras are prefocused and there is nothing to be done except the picture. The lens is designed to focus on everything from a specified distance to infinity. For many people taking pictures occasionally, this is acceptable.

As cameras start having features, auto focus will be one of them. Camera focusing is necessary, because for a picture to be sharp, it must be in focus. This is done by moving the lens in or out from the film or sensor plane until the subject is in focus. On the older cameras this was done on a focusing screen or with a view finder. Many lenses are also marked in distance, feet or meters. The photographer had to measure or estimates the distance, and then preset the lens.

Auto camera focusing made its debut in 1977. They have been many manufactures of cameras with auto focus, but none are perfect. They are much better than the first one, but they can all be fooled. Low light and contrast confuses any auto focus system. High end camera systems will have both auto and manual focus. Manual focus is preferred by professional photographers along with advanced amateurs. Auto focus is for those who do not understand focusing and just do not want to bother with anything that is not automatic.

One accessory that will help with focusing on a 35mm or digital camera is a right angle view finder with a magnifier. This will magnify what you are looking and make focusing easier. If you are using auto focus, make sure the subject you are taking a picture of is sharp and in focus. If it isn’t, try to figure out why. Some cameras will not let you take a picture if it is not in focus.

Remember to always read your instruction manual for the camera. It will help you to understand auto focus.