How to position your ND grad filter
It’s also worth remembering that the positioning of the graduated filter makes or breaks an image. When confronted with a straight horizon, what could be simpler? Yet grad lines are a common sight throughout the photographic world.
The image on above shows how an ND8 hard-step grad has been pulled downwards too far; it’s also on an offset angle.
However, this image directly above shows the correct positioning with the grad line pulled down just enough to stop a light band of sky from creeping in underneath.