Depending on who you speak to or which forum you frequent, long exposure photography can be defined as anything longer than half a second to more than 30 seconds and into minutes or even hours. The effects that you will achieve with longer exposure times will all depend on the speed of the moving elements within the frame and, like everything in photography, there are no hard and fast rules. When creating a long exposure image all the usual considerations of composition and light apply but we add in the element of time. We will create an image that the eye itself cannot see and this requires some vision. Whether you want to record dynamic moving clouds, swirling waters, to record or even eliminate moving people in a busy place, shoot light trails or go completely minimalistic, the possibilities are there for us. Personally, I use long exposure in my landscape work.
In order to create long exposures you need to practice and perfect your technique. Here are some considerations you should think about:
1. Carry your tripod everywhere
A tripod is a must. In long exposure photography, be it light painting, light trails or long exposure in landscapes, the shutter is open for more than a second so it is imperative that you have the ability to keep the camera absolutely still.