To a lot of people graduated filters are an everyday tool, so you might not be interested in the next paragraph, for anyone who is interested in learning a little more about these filters then read on...
A neutral density graduated filter or ND Grad for short, comes in a variety of sizes and strengths. Generally they are rectangular in shape and require a filter holder mounted to the front of the lens to be held in place. Like a normal neutral density filter they reduce to amount of light entering the lens, which darkens the picture. The filters are useful because they only have ND properties from the top to the middle, and the bottom half is clear.
This allows exposures like this one where the sky was incredible bright and the land was very dull to be balanced. If I had not used a grad filter on this shot, either the sky would have been over exposed or the grass would have been too dark to see.
These filters are must in a lot landscape situations where the dynamic range (the difference between the darkest point and the brightest point) is too large for your camera to cope with.
Let me know if you found this useful.
I will reply to all comments given (it make take me a day or so though)
|| Canon 7D || Sigma 10-20mm || f10 || 10mm || 1/80s || ISO 160 || HiTech ND16 Hard Edge Grad ||