Parabolic reflector with polished aluminum or glass mirror that focuses light in a 12–25° beam angle, producing hard, parallel light for long-distance throws.
Technical Details
Standard parabolic reflectors achieve a beam angle of 12° to 25° with maximum light output. The surface is made of polished aluminum or silver-plated glass with a reflectivity of 92-96%. Modern designs use segmented mirrors or Fresnel-like structures for weight reduction. The light source holder is precisely positioned at the focal point, with even a 2 mm deviation significantly degrading light distribution. Professional models offer focusing by axial displacement of the light source by ±10 mm.
History & Development
In 1912, Kliegl Brothers developed the first film-ready parabolic reflector for studio lighting. In 1935, Mole-Richardson revolutionized the technique with the "Type 412 Brute Arc," a 225-ampere system with a 61 cm parabolic mirror. In the 1960s, HMI lamps enabled more compact designs with higher light output. Modern LED arrays since 2010 allow for variable color temperature and DMX control with a 70% reduction in power consumption.
Practical Use in Film
Cinematographer Roger Deakins used parabolic reflectors for the moonlight scenes in "1917" (2019) to achieve hard shadows with maximum throw. For daylight exterior shots, 120 cm paras compensate for the sun as fill light from up to 50 meters away. The precise light control is particularly suitable for selectively illuminating individual actors in group scenes. Disadvantages include the high weight (25-80 kg) and the complex alignment for moving shots.
Comparison & Alternatives
In contrast to Fresnel spotlights, parabolic reflectors produce harder, parallel light without a halo. Softboxes and diffusers create softer illumination but achieve only a fraction of the throw. LED panels with parabolic optics today offer similar light quality with lower weight and power consumption. For extreme wide-angle shots, classic parabolic reflectors remain without alternative, while softer light shapers are preferred for close-ups and portraits.