Optical modification of lenses to enhance specific characteristics—contrast, veiling glare, flare behavior, or sharpness—to achieve a desired aesthetic or cinematic look.
Lens tuning goes beyond rehousing: here, not just the housing, but the optics themselves are modified. Specialized opticians modify coatings, exchange lens elements, alter iris blades, or specifically adjust the imaging performance. The goal: a look that doesn't exist from the factory.
Methods
The most common tuning methods: contrast reduction by modifying the coating. Increased veiling glare for softer highlights. Removing or exchanging rear elements for altered focus fall-off. Exchanging the iris for different bokeh characteristics. With TRIBE7 Blackwing7 lenses, tuning even happens on set: interchangeable tuning elements allow the character to be changed between takes.
PANAVISION Custom Tuning
Panavision is a pioneer in custom tuning. Their Panaspeed series can be ordered from the factory with reduced contrast and increased veiling glare — the DP specifies the desired look, and Panavision's opticians adjust the lenses. DP Julian Panetta had his Panaspeeds tuned for "Wild Dog" so that the image acquired a soft, dreamlike texture without losing sharpness at the focus point.
Distinction
Tuning is not rehousing. Rehousing changes the housing; tuning changes the optics. And tuning is not a cinemod — a cinemod adds gears but doesn't alter optical performance. The three stages: Cinemod (mechanical) → Rehousing (housing) → Tuning (optics).