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'''Exposure''' is the amount of light needed to form an image. This is measured with a light meter that is built into the SLR camera. It turns on immediately when the camera is switched on. The light meter sensitivity is adjusted by the ISO settings (ISO means: International Standards Organization). ISO is also sometimes referred to as ISO Ratings.
'''Exposure''' is the amount of light needed to form an image. This is measured with a light meter that is built into the SLR camera. It turns on immediately when the camera is switched on. The light meter sensitivity is adjusted by the ISO settings (ISO means: International Standards Organization). ISO is also sometimes referred to as ISO Ratings.
===Light Metering===
There are two types of light meter readings. One is called ''incident''. This is where the light falling on the light meter (a hand held light meter) calculates the exposure. The second (which is on SLR cameras) is called ''reflective'' light metering. This is the light that is registered reflecting off the object being photographed and reflecting into the camera.
Light metering can be adjusted within your camera for particular situations.
In metering there are the terms of correct exposure, under exposed and over exposed.
We are always aiming for correct exposure. One can always bracket (i.e. take a series of different exposures and then choose the best exposure. This can also be achieved by using exposure compensation).
There are different metering systems on the camera
* multi zone metering
* center-weight average metering
* spot metering
Multi zone metering is when the camera evaluates the whole image then decides the best exposure (this is the most commonly used setting, it is often used in landscape photography).
Center-weight average metering is when the camera calculates exposure based on the centre of the image (this is common in portrait photography). Spot metering is when a small select area in the image is used to calculate the overall exposure.
==References==
==References==
