This last weekend i woke up to a nasty rainy day and did not want to spend my day off setting around the house. I googled waterfalls in my area and found this place only 30 minutes away from my house were it said these falls only happen after a good rain.
So i grabbed the family and all my gear and out the door we went. Timing is everything when shooting waterfalls, and a overcast day is best in my opinion since sunny days can cause bad highlights in waterfalls because of the shutter speed you need to use. The key to getting that silky smooth moving water effect requires a longer shutter speed of 1 - 2 seconds or what i used in this shot of 1/3 of a second.
So here's the basic set-up i used with my D90 to get this shot. I put on my Tamron 17-50mm 2.8 lens and a Hoya Polarizer filter and mounted the D90 on my tripod. I then found a good vantage spot in the water were i didn't get to wet (thanks to gore-tex boots) and set the camera to manual exposure. I set my aperture to F/10 and the shutter speed to 1/3 of a second to get that silky smooth moving water effect i was looking for and started shooting away with my remote release and that was basically it! Everything else on the D90 was standard.
I hope you get a chance to photography some waterfalls this way because it's pretty darn fun and easy! For more advanced techniques on shooting waterfalls here's a good web site you might like.