{"schema":"record/v1","id":"art_01M5MRH1JV5KWEBXVX7RSDJD5S","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What does an Unreal Engine Lens File store, what inputs does it need to be calibrated, and how is it evaluated at runtime?","summary":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.","status":"active","body":{"text":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.\n\nCurator qualifications: Documentation read 2026-10-22; no lens calibrated. ST Map support, Live Link requirement for nodal offset and Python API from producer reading.\n\nLimitations: Documentation read 2026-10-22; no lens calibrated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-overview","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-quick-start-for-unreal-engine","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-for-production?application_version=4.27","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/python-api/class/LensFile?application_version=5.4","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"}]},"categories":["T02","T12","T19"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-overview","claim":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.","locator":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-ae4b79d7fd88f4fb3e1333ae493c1f97379c2d45/record.json#p-ae4b79d7fd88f4fb3e1333ae493c1f97379c2d45/record","import_batch_id":"pipe-338f43c191fced2e36da32644875ff69979cd0c5","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-338f43c191fced2e36da32644875ff69979cd0c5","original":{"body":{"text":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.\n\nCurator qualifications: Documentation read 2026-10-22; no lens calibrated. ST Map support, Live Link requirement for nodal offset and Python API from producer reading.\n\nLimitations: Documentation read 2026-10-22; no lens calibrated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-overview","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-quick-start-for-unreal-engine","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-for-production?application_version=4.27","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"},{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/python-api/class/LensFile?application_version=5.4","note":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)"}]},"tags":[],"type":"article","links":[],"title":"What does an Unreal Engine Lens File store, what inputs does it need to be calibrated, and how is it evaluated at runtime?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.","evidence":{"claims":[{"url":"https://dev.epicgames.com/documentation/en-us/unreal-engine/camera-lens-calibration-overview","claim":"Unreal's Lens File stores five Brown-Conrady distortion parameters (K1, K2, P1, P2, K3), camera intrinsics and nodal point offsets keyed by focus and zoom, interpolated between calibrated points; Epic says to make a new Lens File for each lens and camera body combination.","locator":"Epic docs: Camera Lens Calibration overview (live); Epic docs: Camera Lens Calibration quick start (live)","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T02","T12","T19"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T19.03"],"confidence":"Low.","limitations":["Documentation read 2026-10-22; no lens calibrated.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. 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