So the basic idea of "Leaking light" is simulate older camera with small (or large) opening that would exposing the film to light.
The final image will have a neat light streaks/fx as result. Holga and some old pinhole cameras were very well known for this.
This is the first test (playing around) with a converted macro tube with lens glass and the Pentax 55mm lens.
Holding them in all sorts of odd angles and distance to get the desire effect.
Apply them in a Photoshop layer.
Since there's no limit on achieving the desire effect. More of these to come...