Focusing a Sun Oven is very easy. All that is required is to watch the shadows created by the oven. When the shadows are even on all sides, the cooker is directly focused. The built-in leveling leg on the back of the oven allows for easy tracking. You regulate the temperature by turning the oven towards the sun and focusing the oven. If you want the oven at a high temperature you turn the oven towards the sun and directly focus the oven. If you want a lower temperature in the oven you focus the oven directly, then turn the oven slightly out of direct focus.