As a photography enthusiast, i have recently purchased an ND (neutral density) filter, with a strength of 10 stops. This is a very dark filter, which essentially enables me to take photographs with a much longer exposure time during daylight hours. Most people from what i have seen, have filters which only stop the exposure down a few stops, enabling the same effect, but not quite so much.
The idea behind being able to take longer exposures during the day, is so that you can take photographs which capture motion. Skies become a lot more textured, and water becomes silky smooth when your exposing on average of 20 seconds, and as can be seen here it makes the image a lot more dramatic and impressive!
As you can see, with the right scene, the results are simply beautiful. Unfortunately i haven't been able to find a location quite so suitable as of yet, but i have been messing around with local rivers, and so far i have definitely been impressed with this little gizmo!
If anyone is interested in buying said filter, then it can easily be found on the Internet by simply google searching 'ND110' and for an average price of £45 you really can't go wrong!