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Hi Vinny,
A graduated filter is darker on the top section and gradually decreases to having no effect on exposure at all.. They attach to the front of your lens, using an adapter filter holder..
Each filter refers to the amount of light or stops they hold back, example, 1 stop, 2 stop, etc,etc... This helps you to calculate the difference between the sky and the foreground..
If you put your camera into Aperture mode and take a reading from the sky, lets say it reads 1/250 @ f22 and you then point the camera at the foreground, (try not to get the sky in frame when you do this) and it reads 1/60 @ f22.. Then the difference between the sky and foreground is 2 stops of light, you then choose a 2 stop filter, place this onto your lens, put your camera in manual and dial in the reading for the foreground. 1/60 @ f22, therefore balancing the exposure.. You then have a starting point for which you can experiment...
Cheers
Lee
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