Quick-clamp with lever mechanism for tool-free mounting of lights and equipment on set. Clamping range 16–35 mm, load capacity up to 25 kg, setup time 15–30 seconds.
Technical Details
Standard speed clamps feature a clamping opening of 16-35 mm diameter and generate a clamping force of 800-2000 N. The lever mechanism operates with a gear ratio of 1:8 to 1:12, making a hand force of 15-20 N sufficient. Structurally, they are made of anodized aluminum or chrome-plated steel with a weight of 180-450 g. Common variants include the Baby Speed Clamp (⅝" spud), Junior Speed Clamp (1⅛" spud), and the Senior Speed Clamp (1⅝" spud).
History & Development
Matthews Studio Equipment developed the first film-ready speed clamp in 1962 as an alternative to screw connections. Lowel-Light Manufacturing perfected the design in 1968 with the Tota-Clamp, which became an industry standard. In 1975, Manfrotto introduced the first speed clamp with an integrated safety screw. Modern variants from Kupo or American Grip have offered carbon fiber elements since 2010, achieving weight reductions of up to 40%.
Practical Use in Film
In "Blade Runner 2049" (2017), DoP Roger Deakins used speed clamps for the precise positioning of LED panels on irregular set constructions. The technology allows for quick repositioning of lights between takes – setup times of 15-30 seconds per unit are typical. Especially for handheld shots, lightweight speed clamps prove useful for attaching on-camera lights to camera rigs. A disadvantage is their limited load capacity compared to screwed connections and their susceptibility to vibrations with heavy tungsten lights.
Comparison & Alternatives
Unlike C-clamps, speed clamps require no tools but are less vibration-resistant. Magnetic clamps offer even faster mounting but are limited to ferromagnetic surfaces. For loads exceeding 25 kg, screwed clamps are still used. Modern twist-lock systems from Arri or Dedolight combine the speed of a speed clamp with higher security but cost three times as much.