# Which lens-metadata systems (Cooke /i, ZEISS eXtended Data, ARRI LDS) publicly document their fields, and which of those fields end up in recorded files?

- id: art_01M5NNX1P4GVVZXV5NZE90YMNS
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T02, T19 · tags: none
- updated: 2026-10-24T00:45:19.421Z
- url: https://veyrul.com/articles/art_01M5NNX1P4GVVZXV5NZE90YMNS

Cooke's /i FAQ lists per-frame lens fields (including entrance pupil position) recorded at up to 285 fps and says the extent recorded is the camera maker's choice; SMPTE RIS camdkit (0362321d) decodes entrance pupil and aperture from RED-recorded Cooke /i binary but leaves entrance pupil unmapped (TODO) in its ARRI CSV path.

Cooke's /i FAQ lists per-frame lens fields (including entrance pupil position) recorded at up to 285 fps and says the extent recorded is the camera maker's choice; SMPTE RIS camdkit (0362321d) decodes entrance pupil and aperture from RED-recorded Cooke /i binary but leaves entrance pupil unmapped (TODO) in its ARRI CSV path.

Curator qualifications: Superseded in part: the claim that the 2021 Part I protocol PDF is unreachable holds for cookeoptics.com only; the same file name is served by cookeoptics.cn (C2-B53-P1-10, CA-B082 row 2). The FAQ field list omits the distortion/shading commands Part I lists (AUDIT1 row 19); do not treat it as complete. ZEISS and ARRI LDS statements (E4-E6) not reinspected. Cooke /i Part III: producer withheld hold preserved; not fetched. Text and static code reading only; no lens data decoded from real files.

Limitations: Text and static code reading only; no lens data decoded from real files.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://cookeoptics.com/product/i-technlogy/",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://cookeoptics.com/itechpartners/",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://www.arri.com/en/learn-help/learn-help-camera-system/frequently-asked-questions/lens-data-system-faq",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://www.zeiss.com/content/dam/pno/downloads/cine-lenses/manuals/extended-data-workflow/manual-zeiss-extended-data-workflow-sony-venice-camera.pdf",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://www.zeiss.com/content/dam/pno/downloads/cine-lenses/manuals/extended-data-workflow/manual-zeiss-extended-data-workflow-red-dsmc2-cameras.pdf",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://github.com/SMPTE/ris-osvp-metadata-camdkit/blob/0362321d03721a07029329cfc6f9e1e47bfa2bdf/src/main/python/camdkit/arri/reader.py",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    },
    {
      "url": "https://github.com/SMPTE/ris-osvp-metadata-camdkit/blob/0362321d03721a07029329cfc6f9e1e47bfa2bdf/src/main/python/camdkit/red/cooke.py",
      "note": "cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Cooke's /i FAQ lists per-frame lens fields (including entrance pupil position) recorded at up to 285 fps and says the extent recorded is the camera maker's choice; SMPTE RIS camdkit (0362321d) decodes entrance pupil and aperture from RED-recorded Cooke /i binary but leaves entrance pupil unmapped (TODO) in its ARRI CSV path. · locator: cookeoptics.com/product/i-technlogy/ FAQ 'What is /i Technology?' and post-production answer; cookeoptics.com/wp-content/uploads/2021/11/Cooke-i-Technology-Part-I-2021.pdf; camdkit red/cooke.py at 0362321d (BSD-3-Clause); camdkit arri/reader.py lines 83-93 · source: https://cookeoptics.com/product/i-technlogy/

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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