Track the Sun’s Position
The position of the sun and the path it will follow are also important when planning a long exposure photography shot. It is a good rule to completely exclude the sun from the composition as much as possible.
The first reason is that with long exposure photography the sun will no longer be circular but you will start to see its movement during the exposure.
And secondly, it will create a completely overexposed area, impossible to correct in post production.
To preview the sun path you can use a lot of mobile apps. I use Photopills to plan my shots and you can find it on the Apple Store and Google Play Store.
Location Scout Beforehand
As I said before, long exposure photography looks very different from the reality perceived by our eye. This is why it’s necessary to have a clear idea of what you will find on the field.
Location scouting also means getting a preview of your composition. You’ll have a better idea of the possible direction of the clouds and sunlight, the power of the sea and tide, or how the light will reach the mountains.