Schott glass-ceramic with extremely low thermal expansion for thermally stable camera components such as sensor mounts and reference mirrors.
Lydith 30 has a density of 2.17 g/cm³ and achieves a flexural strength of 65 MPa with a compressive strength of 500 MPa. Its thermal conductivity is 1.64 W/(m·K), while the Young's modulus is 55 GPa. The material exhibits exceptional dimensional stability over a temperature range of -196°C to +700°C. In optical manufacturing, its homogeneous crystal structure allows for a surface roughness of Ra < 1 nm after appropriate processing. The chemical composition primarily consists of Li₂O·Al₂O₃·nSiO₂ with controlled β-spodumene and β-quartz solid solution phases.
Schott first developed Lydith 30 in 1968 as an advancement of Zerodur technology for astronomical telescopes. Its initial application in film technology occurred in 1973 in high-resolution reproduction cameras for Technicolor printing facilities. In 1981, Panavision integrated Lydith 30 components into their Super 70 camera systems for handling temperature fluctuations during exterior shoots. ARRI began using the material in 1995 in the first digital cinema camera prototypes for thermally stable sensor mounts. The modern RED camera series has utilized Lydith 30 elements since 2007 for stabilizing the sensor assembly at 6K and 8K resolutions.
Lydith 30 is primarily used in thermally critical camera components: sensor mounts, reference mirrors in viewfinder systems, and precision filter holders. For "Blade Runner 2049" (2017), Roger Deakins used ARRI ALEXA cameras with Lydith 30-stabilized sensor modules for consistent color reproduction during extreme temperature fluctuations from LED walls. Steadicam gyro systems utilize Lydith 30 reference surfaces for precise horizon calibration. In 65mm IMAX cameras, the material prevents thermal defocusing during long takes under studio lights. The workflow requires specialized processing methods and cleanroom manufacturing.
In contrast to Zerodur (α = 0 ± 0.05 × 10⁻⁶/K), Lydith 30 offers better mechanical properties with a slightly higher coefficient of expansion. Invar alloys achieve similar thermal stability but are 3.6 times heavier and magnetic. Carbon fiber composites offer comparable weight advantages but with anisotropic properties and moisture sensitivity. Ultra-Low-Expansion (ULE) glasses from Corning Inc. represent the most direct alternative, but they come at a higher cost for comparable properties. Modern silicon carbide ceramics surpass Lydith 30 in stiffness but require more complex coatings for optical applications.
Lydith 30 garantiert mir konsistente Schärfenebenen auch bei drastischen Temperaturschwankungen zwischen klimatisierten Innenräumen und heißen Außensets. Die thermische Stabilität der Sensorhalterung eliminiert Mikroverschiebungen, die bei 6K-Aufnahmen sofort sichtbar würden. Besonders bei langen Steadicam-Einstellungen unter heißen Studioleuchten bleibt die Kalibrierung der Gyrosysteme präzise.
Die absolute Dimensionsstabilität von Lydith-30-Komponenten ermöglicht mir perfekte Match-Cuts zwischen verschiedenen Drehtagen und -bedingungen ohne sichtbare Schärfeverlagerungen. Bei komplexen Sequenzen mit wiederholten Kamerafahrten kann ich sicher sein, dass die mechanische Wiederholgenauigkeit der Kamerasysteme konstant bleibt. Das schafft Vertrauen in die technische Umsetzung meiner visuellen Vision.
Lydith-30-Komponenten bedeuten höhere Anfangsinvestition, aber drastisch reduzierte Nachbearbeitungskosten durch eliminierte Schärfekorrekturen und Retakes. Die Ausfallsicherheit bei extremen Drehbedingungen minimiert Versicherungsrisiken und Terminverzögerungen. Langfristig amortisieren sich die Mehrkosten durch reduzierten Wartungsaufwand und längere Kameralebensdauer.
1. Zu welchem Department gehört „Lydith 30"?
2. Wie viele verschiedene Fachperspektiven bietet dieser Eintrag?
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