I personally used a 35mm prime lens when capturing images of the sky for this project. When capturing sky overlays the objective is to get as much cloudy, fluffy goodness as you can fit into your lens, for this reason I prefer to use a lens with a wider focal length.
The best part is, it’s so easy, and everyone can do it. I came up with a solution, to make my own sky overlays. In this tutorial we are using our sky images as overlays to create skies where they do not exist or could be enhanced. A quick note: An overlay is simply an image captured by camera or otherwise constructed in an editing program.