Security Camera | Pocket Digital Cameras

One of the important phases of shooting a good photo is focusing on the photo?s objects. Photos that are out of focus look bad and blurry. Sometimes shooting out of focus objects is done on purpose as an artistic effect but in most cases a sharp focused object is the photographer goal.

Most low-end pocket digital cameras do all the focus work for you. cameras. With digital SLR cameras you can see how well the objects in the photo are focused and correct the focus as needed.

digital-slr

Digital cameras support at least three focus modes:

• Manual focus: In this mode the camera does not automatically focus on the objects in the photo. When you are happy with the focus you can press the shutter button to take the photo. 

•  Single auto focus: In this mode the camera automatically focuses on the objects in the photo. The camera automatically focuses when you press the shutter button either all the way down to shoot a photo or half way down to lock the focus. This mode is useful when shooting static objects. The camera will run the auto focus process

•  Continuous auto focus: In this mode the camera continuously focuses on the objects in the photo. Once the shutter button is pressed and as long as it is held half way down the camera continuously focuses on the objects in the photo. In this mode the camera continuously corrects the focus as the objects distance from the camera changes. The camera will continuously keep the object in focus.

 Why should I care about my digital camera CCD sensor size?

One characteristic of digital cameras that many ignore is the sensor size.

Digital cameras capture digital photos. A digital photo is a collection of pixels. The CCD sensor is a silicon chip that is built of many tiny light sensors. It is intuitive that for the same CCD sensor size, the more mega pixels the smaller each CCD tiny sensor is. For each CCD sensor size and number of mega pixel we can calculate the pixel sensor size.

Your digital camera sensitivity to light is directly influenced by the pixel sensor size. The result is that bigger pixel sensor sizes allow for faster shutter speeds at lower light conditions. In addition bigger pixel sensor sizes result in less noise captured by each such sensor.

Bigger CCD sensors are more expensive. For that reason cheaper pocket cameras use smaller sensors than high end digital SLR cameras. CCD sensor size also influences other optical attributes of the camera ?

So, how to choose the right digital photography ?

By Ziv Haparnas