Overexposed area caused by light reflection on specular surfaces (metal, glass, water). Occurs at reflectance values above 90% and causes clipping in digital cameras.
Hot spots occur with reflection values above 90% on reflective surfaces such as metal, glass, or water. In digital cameras, brightness values above 100 IRE (Institute of Radio Engineers) lead to clipping of the video signal. Fresnel spotlights with 2K-5K wattage at distances under 2 meters from the subject are particularly critical. Typical areas where they occur are eyeglass lenses (reflectivity 4-8%), polished metal surfaces (up to 95%), and wet skin (12-15% compared to 2-5% for dry skin).
The problem has existed since the dawn of cinematography around 1895, but intensified with the introduction of tungsten lighting in the 1920s. Arri's founders developed the first diffusion filters in 1932 to avoid hot spots. With the digital revolution starting in 2000, the problem was exacerbated by the lower dynamic range of CCD sensors (8-10 stops) compared to film (12-14 stops). Modern cameras like the Alexa 35 achieve 17 stops again, significantly reducing hot spot issues.
Roger Deakins avoids hot spots by using large-area LED panels instead of point sources, visible in "Blade Runner 2049" in the office sequences. Unwanted hot spots are eliminated using polarizing filters (circular polarization with 45° rotation), honeycomb grids, or diffusion material like Opal Frost. In "The Matrix," Bill Pope deliberately used hot spots on sunglasses as a stylistic device for the digital world. Post-production corrections are made through highlight recovery on RAW material or local exposure adjustments.
Hot spots differ from lens flares due to their static nature and lack of optical artifacts. While blown-out highlights can affect the entire image, hot spots remain locally confined. Modern LED systems like SkyPanels, due to their large-area emission, produce fewer hot spots than traditional tungsten spots. Bounced light off white walls or polystyrene boards completely eliminates hot spots but reduces light intensity by 2-3 stops.
Ich erkenne Hot Spots sofort am Zebramuster meines Monitors bei 100% IRE und korrigiere durch Flagging oder Scrim-Einsatz. Bei Gesichtsaufnahmen verwende ich grundsätzlich Opal Diffusion, um Hautreflexionen zu vermeiden, besonders bei verschwitzten Darstellern unter heißen Tungsten-Lampen.
Hot Spots zerstören die Bildkomposition und lenken vom Storytelling ab - außer ich setze sie bewusst als visuelles Element ein. Bei Actionsequenzen nutze ich kontrollierte Hot Spots auf Waffen oder Fahrzeugen, um Dramatik zu verstärken, lasse aber nie das Gesicht der Darsteller davon betreffen.
Hot Spots bedeuten teure Nachkorrekturen in der Post, die bei 4K-Material schnell 500-800 Euro pro Drehtag kosten. Ich sorge für ausreichend Grip-Equipment und erfahrene Beleuchter, da Reshoots wegen technischer Mängel das Budget um 15-20% sprengen können.
1. Zu welchem Department gehört „Hot Spot"?
2. Wie viele verschiedene Fachperspektiven bietet dieser Eintrag?
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