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Proskar

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Anamorphic lens system by SOM Berthiot (1954) featuring cylindrical glass elements that compress horizontally at 2:1 ratio, distinguished by characteristic blue front elements.

Technical Details

The Proskar system uses cylindrical glass lenses that compress exclusively in the horizontal direction. The lenses typically have focal lengths between 35mm and 100mm with a maximum aperture of f/2.8. The characteristic blue coating on the front lens reduces stray light by approximately 15% compared to untreated surfaces. Proskar lenses produce horizontal lens flares and oval bokeh circles in a 2:1 ratio. The minimum focus distance is 1.2 meters, and the filter thread is a standard 95mm.

History & Development

SOM Berthiot introduced the Proskar system in 1954 as an alternative to CinemaScope after 20th Century Fox drastically increased royalties for their anamorphic lenses. The system was first used in the French film "Napoléon" (1955) by Sacha Guitry. In 1962, Angenieux took over production and significantly improved the optical quality. Production ended in 1978 when Panavision and Technovision dominated the market. Today, approximately 200 functional Proskar lenses still exist worldwide.

Practical Use in Film

Proskar lenses were mainly used in French and Italian productions of the 1960s, including Sergio Leone's "Once Upon a Time in the West" (1968). The lenses require special calibration of the camera viewfinder and precise alignment, as even a 0.5° rotation can cause visible image distortion. In night shots, Proskar lenses tend to exhibit characteristic double contours around light sources. The depth of field is equivalent to that of a spherical lens of the same focal length.

Comparison & Alternatives

In contrast to CinemaScope lenses, Proskar lenses have lower chromatic aberration but stronger vignetting at the image edges. Modern Hawk V-Lite or Cooke Anamorphic/i lenses offer significantly better optical performance but do not achieve the specific "vintage look" of Proskar optics. While Panavision lenses are exclusively rented, Proskar lenses can be purchased – albeit at collector prices between 15,000 and 25,000 Euros per lens.

From the crafts

Perspectives

Cinematographer

Ich schätze die warme, leicht diffuse Bildcharakteristik der Proskar-Objektive, auch wenn sie technisch nicht an moderne Anamorphic-Linsen heranreichen. Bei Available-Light-Situationen muss ich wegen der relativ lichtschwachen f/2.8-Blende oft auf zusätzliche LED-Panels zurückgreifen. Die horizontalen Flares geben Nachtszenen aber eine unverwechselbare Atmosphäre, die digital nur schwer zu replizieren ist.

Director

Proskar-Objektive verleihen meinen Filmen diese spezielle 60er-Jahre-Ästhetik, die perfekt zu Thriller- oder Western-Stoffen passt. Die leichte Bildunschärfe an den Rändern lenkt den Blick natürlich ins Bildzentrum und unterstützt die Fokussierung auf die Hauptfigur. Bei Dialogszenen nutze ich bewusst die ovalen Bokeh-Kreise, um eine nostalgische Stimmung zu erzeugen.

Producer

Ein Proskar-Set zu mieten kostet etwa 1.200 Euro pro Drehtag – deutlich mehr als Standard-Anamorphic-Objektive, aber weniger als High-End-Panavision-Optiken. Problematisch ist die begrenzte Verfügbarkeit und dass nur wenige Kamera-Assistenten Erfahrung mit der aufwendigen Kalibrierung haben. Bei internationalen Co-Produktionen plane ich grundsätzlich zwei zusätzliche Reservetage für mögliche technische Probleme ein.

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