How do practitioner and digital-era sources qualify film-era lighting-ratio rules?

The inspected sources do not replace the 1953 numbers with a digital equivalent. They move the decision to measured stops from exposure tests (CML, film era), consistency within a scene's coverage, light meter/false colour/waveform checks, and the trade between raising key and cutting fill for noise versus highlight headroom (Deakins forum, 2023 and 2025). No manufacturer sensor-latitude statement was retrieved, so any digital numeric rule is unsupported here. Curator qualifications: All quotes verified. The flagged 'conflict' is a reported range of practitioner preferences (ratios rejected, used, or useful for teaching), not contradictory evidence. The 4:1 ceiling is tied to colour film in the 1953 source; no digital-sensor ceiling is supported (producer bound correct). Attribution of the 'T-stops and ratios' reply is ambiguous in the mailing-list signature layout (Nick Anthony vs Brent Reynolds); cite it as 'a list participant'. Reclassify conflicting_evidence as a range of practitioner views. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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      "url": "https://cinematography.net/edited-pages/LightingRatios.htm",
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      "url": "https://www.rogerdeakins.com/forums/topic/lighting-ratios/",
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      "url": "https://education.siggraph.org/static/HyperGraph/lighting/lighting_film_video.htm",
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