Mechanical rotation of the lens focus ring to shift focal plane. Cinema lenses use 0.8mm pitch with 1:3 to 1:8 gear ratios for precise focus pulls.
Standard film optics use mechanical focus rotation with a pitch of 0.8 mm between the threads of the focus ring. Translation is achieved via gears with ratios between 1:3 and 1:8, enabling precise micro-adjustments. Cine lenses offer linear focus rotation, where equal rotation angles produce proportional shifts in sharpness. Photo lenses, on the other hand, often employ non-linear characteristics with accelerated rotation in the far range. Follow focus systems engage with the focus rotation via standardized 0.8 pitch gears, allowing for translations up to 1:4 for extreme precision.
Mechanical focus rotation was established in 1923 with the first Cooke Panchro lenses, which positioned a dedicated focus ring outside the aperture ring. Previously, focus adjustment was done via axial displacement of entire lens groups. In 1952, Angenieux introduced the 270° standard for zoom lenses, which is still in use today. Electronic focus control supplemented mechanical rotation starting in 1995, but never completely replaced it. Modern lenses combine both systems, offering switchable options between manual and motorized focus rotation.
In "Citizen Kane" (1941), Gregg Toland utilized extreme focus pulls across the entire rotation range to create deep focus compositions. "The Matrix" (1999) employed remote-controlled focus rotation for the famous Bullet Time sequences, where 120 synchronized cameras executed identical focus pulls. First ACs (Focus Pullers) mark critical focus points with tape on the focus ring and execute rotation movements according to precise timing plans. For Steadicam shots, focus rotation is performed via wireless remote control with motorized follow focus systems, as manual operation becomes impossible.
Focus rotation differs from focus breathing, which describes focal length changes due to focusing. Autofocus systems replace manual rotation with servo motors but offer less creative control over focus pulls. Wireless follow focus systems like Preston FIZ transmit rotation commands digitally, enabling complex, programmable focus pulls. For extreme wide-angle shots below 14 mm, focus rotation becomes negligible as the depth of field approaches infinity. Anamorphic lenses, due to their specific construction, often require enhanced focus rotation with gear ratios up to 1:12.
Ich verwende die Fokusrotation als direktes Gestaltungsmittel – bei einer Arri Signature Prime drehe ich 90° um von einem Gesicht auf 0,8m zu einem Hintergrund auf 5m zu wechseln. Die taktile Rückmeldung des mechanischen Fokusrings gibt mir die Präzision, die ich für subtile Schärfenverlagerungen brauche, besonders bei Nahaufnahmen wo bereits 2° Rotation den Fokuspunkt verschieben.
Mit gezielter Fokusrotation lenke ich die Aufmerksamkeit des Publikums und schaffe emotionale Übergänge – eine langsame Drehung von der weinenden Protagonistin zur unscharfen Tür, durch die der Antagonist eintritt, erzeugt Spannung ohne Schnitt. Ich plane Fokusfahrten wie choreographierte Bewegungen und nutze sie um zwischen verschiedenen Erzählebenen zu wechseln.
Komplexe Fokusrotationen verlängern meinen Drehtag erheblich – ein Follow-Focus-System kostet täglich 150€, ein Funk-Follow-Focus 400€, dazu brauche ich einen erfahrenen Focus Puller für 450€/Tag statt eines Standard-Assistenten für 280€. Bei 30 Takes mit präzisen Fokusfahrten kalkuliere ich 20% mehr Drehzeit und plane Backup-Equipment, da Fokus-Technik häufig ausfällt.
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