To get the perfect exposure
There is a cheap but very effective device called an 18% grey card that can limit your frustration if used correctly,this is done when you are still unsure about getting the correct exposure.When light falls upon a certain object; if the object is too dark your camera or meter will automatically give you an over-exposed reading. This also happens when we take a reading from something that is too
bright – the meter gives us an under-exposed reading.
We need to find a mid-tone object for our meters to read the proper exposure.Sometimes if we are taking pictures in a high contract scene a mid-tone object is impossible to find. 18 % grey is the mid-tone between pure white and pure black. An 18% grey card will record the exact light that will touch any object. Start by placing the grey card where you are going to take your reading, point your camera or light meter at the grey card – your meter should read the exact light that falls upon the card.
These cards can be used for all types of photography. All light-meters are calibrated to produce an exposure of 18% The grey card reflects the exact same reading.This card is cheap, and most decent camera stores should sell them. The 18% grey card should become an important part of your equipment. If you shoot with digital or film cameras, and whether you use black and white or colour film then the grey card can be used.