Deepen your knowledge of lighting theory as Karl delves into the physics of photography to give you some valuable tips for manipulating and controlling light in your images.

This creepy, unsettling fashion image was actually a lot of fun to shoot. Watch Karl go to the dark side in this masterclass in light and shadow.

In this fascinating fashion shoot, Karl juxtaposes bold pastel colours with textured patterns, lighting the shot with a bare bulb to imitate sunlight and create harsh shadows. In the accompanying post-production class, watch Karl edit and retouch the image.