Archive for Basic Camera Controls

Basic Camera Controls Part2

Next in line on the basic controls of a digital camera are as follows:

Focus:

Digital Cameras have autofocus,this allows the camera to choose the correct focus distance for you,usually based on the contrast of an image(the image will be at maximum contrast when in sharp focus) or a mechanism such as an infrared sensor that measures the actual distance to the subject.Cameras can be set for a single autofocus(the lens is not focused until the shutter release is partially depressed/pressed lightly) or continuous autofocus(the lens refocuses constantly as you frame and reframe the image,as the shutter release has been partially depressed/pressed lightly).

Depth Of Field(DOF):

The range of distance in a scene that appears to be in focus and will be reproduced as being acceptably sharp in an image. It is controlled by the lens aperture,and extends for a distance in front of and behind the point on which,the lens is focused.

Basic Camera Controls

Today we are going to talk about the basic camera controls that most digital cameras have.

Before that,I am personally using a Canon Powershot A150 and an Olympus D540 Camera…

Both of them are in the Compact/Hybrid Category..Having features that most DSLR’s have..

Here are the basic camera controls that i think should be known to amateur/beginner/entry-level photographers:

Aperture: Lens opening

-A small hole,circular opening inside the lens that can change in diameter to control the amount of light more or less reaching the camera’s sensor as the picture is taken. Aperture sizes is expressed in f-numbers Ex.f1.4,f2,f2.8 etc.   The lower the number,the larger the aperture.

here’s a picture taken with an f1.1 setting to see more pics go to this site..

http://photo.net/canon-eos-digital-camera-forum/00GhUR

Shutter speed- Exposure Speed

Camera’s shutter speed is a measurement of how long it’s shutter remains open as the picture is taken. The shutter speed is set to, ex:1/30,1/60,1/125th of a second. The Slower the shutter speed the longer the exposure time.

Here’s an example: picture taken from…

http://sharinak.com/2009/08/24/photography-tutorial-shutter-speed-victoria-photographer/

credits goes to her.

Digital Sensor Sensitivity

A camera’s ISO Setting/ISO Speed is a standard which describes it’s absolute sensitivity or measure of degree of response of it’s sensor to light. ISO Settings are usually listed as factors of 2,such as ISO 50,ISO 100,ISO 200 and can have wide range of values.

Higher numbers represent greater sensitivity and the ratio of two ISO Numbers represents their relative sensitivity,meaning a photo at ISO 200 will take half as long to reach the same level of Exposure as one taken in ISO100(all other settings being equal).

ISO Speed is analogous to ASA Speed For Different films,however a single digital camera can capture images at several different ISO Speeds.This is accomplished by amplifying the image signal in the camera,however this also amplifies noise and so higher ISO Speeds will produce progressively more noise.

Go to this website for Sample Images..http://web.canon.jp/imaging/eosd/samples/eos1dm4/

Credits goes to Canon…

Image Noise:

“Image Noise” is the digital equivalent of film grain for analogous cameras.This noise appears as random speckles on an otherwise smooth surface and can significantly degrade image quality.Noise increases with the sensitivity setting in the camera,length of exposure,temperature and even varies amongst different camera models.

Example Taken from http://www.savs.hcc.edu.tw/~chuavv/guide/gimp/gimp-2.6/images/filters/examples/noise-taj-scatter-rgb.jpg

Credit goes to them.