Anamorphic adapter mounted in front of the primary lens — produces 2.39:1 widescreen with characteristic lens flares and bokeh.
Technical Details
Front anamorphic lenses compress the image with a squeeze factor of 2:1, transforming a 2.39:1 aspect ratio into a 1.195:1 format that fits within the 1.37:1 area of 35mm film. The focal length of the primary lens is not altered by the front anamorphic adapter, but the effective aperture shifts by approximately half a stop. Typical diameters are 138mm, 142mm, or 162mm, depending on the primary lens used. The cylindrical optics produce characteristic oval bokeh circles and horizontal lens flares.
History & Development
The first front anamorphic adapter was developed by Gottschalk & Sons in 1926 for Henri Chrétien's Hypergonar system. 20th Century Fox adapted this technology in 1952 for CinemaScope, bringing it to commercial use for the first time with "The Robe." Panavision revolutionized the technique in 1954 with the Auto Panatar Front Anamorphic adapter, which delivered sharper images and less distortion. Modern manufacturers such as Hawk, Cooke, and Atlas now produce high-quality front anamorphic adapters with multi-coating and reduced chromatic aberration.
Practical Use in Film
Sergio Leone used front anamorphic adapters in his Western epics like "Once Upon a Time in the West" (1968) for their characteristic panoramic shots. Christopher Nolan employs Panavision front anamorphic adapters in "Dunkirk" (2017) and "Tenet" (2020) to seamlessly integrate IMAX sequences with anamorphic 35mm footage. The workflow requires special viewfinders with anamorphic markings and monitors with a de-squeeze function. Disadvantages include light loss, increased weight on the lens, and the need for specialized matte boxes.
Comparison & Alternatives
Unlike rear anamorphic adapters, which are built between lens elements, front anamorphic adapters can be flexibly combined with various primary lenses. Modern alternatives include fully anamorphic lenses such as the Panavision C-Series or Arri Master Anamorphic, which operate without auxiliary lenses. Digital alternatives like the RED Weapon 8K with a 17:9 sensor or the Alexa LF with Open Gate can record widescreen formats without anamorphic optics, but they forgo the characteristic anamorphic image aesthetic.