Camera flash, a camera, and a method of generating a flash

A camera flash for a camera, the camera flash comprising:

• a lightguide arranged to extract light at least through one surface;
• one or more light sources arranged, in use, to emit light into the lightguide, and three or more optical films;
• wherein the or each light source is an LED or a laser diode;
• wherein the flash is connectable in use to drive circuitry, the drive circuitry being for driving the light source(s) to emit a pulse of light,
• wherein the lightguide is a planar lightguide having two opposed major surfaces and at least one minor surface, the lightguide being arranged to extract light at least through one major surface,
• wherein each of the three or more optical films is provided over a major surface of the lightguide,
• wherein light extraction features for extracting light from the lightguide are arranged on at least one major surface of the lightguide, wherein the number density of the extraction features vary so as to be greater further away from the light sources so that there is more extraction further away from the light sources, and
• wherein an angular range of light emitted by the camera flash is substantially equal to a field of view of the camera.