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    "abbrevTitle": "J SMPE",
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    "abstract": "An instrument for calibrating iris scales of photographic lenses is described. The iris scales are calibrated in T stops based on the photometric transmission parallel to the axis. This follows the procedure proposed by Daily.1 The new instrument employs measuring and comparison of optical paths which receive alternate light pulses from a single incandescent source. Calibrated attenuation is provided in the comparison beam so that the two systems may be balanced to give a null output from the photomultiplier cell which is used as a null detector. The null-balance principle makes the unit extremely stable and the sensitivity is sufficient to make accurate measurements on iris openings as small as 0.031 in., which corresponds to 1 in. T 32. Data are given on transmission of several lens types, and on the accuracy of the instrument, and a proposal is made for changing over to the new system.",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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    "authors": [
      "M. G. Townsley"
    ],
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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      "holder": "Society of Motion Picture and Television Engineers, Inc.",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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        "updated": "2026-05-22T21:44:19.125Z",
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      },
      "year": "1947",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
        "source": "parsed",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docId": "10.5594-J17822",
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      "version": "smpte-journal-article-nlm@v1"
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    "docLabel": "Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947)",
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      "version": "smpte-journal-article-nlm@v1"
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    "docTitle": "An Instrument for Photometric Calibration of Lens Iris Scales",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docType": "Journal Article",
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      "updated": "2026-05-22T21:44:19.125Z",
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    "doi": "10.5594/J17822",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
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    "href": "https://doi.org/10.5594/J17822",
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      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J17822",
      "source": "inferred",
      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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    "issn": {
      "print": "0097-5834",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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        "updated": "2026-05-22T21:44:19.125Z",
        "version": "smpte-journal-article-nlm@v1"
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_49_2/MIJR15Vol49No2.xml)",
      "source": "parsed",
      "updated": "2026-06-17T00:17:09.425Z",
      "version": "smpte-journal-issue-xml@v1"
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    "number": "2",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
      "source": "parsed",
      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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    "pages": "111–122",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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    "publicationDate": "1947-08-01",
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      "source": "parsed",
      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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    "publisher": "SMPTE",
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      "confidence": "high",
      "note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
      "source": "inferred",
      "updated": "2026-05-22T21:44:19.125Z",
      "version": "smpte-journal-article-nlm@v1"
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      "city": "White Plains, NY",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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        "updated": "2026-05-22T21:44:19.125Z",
        "version": "smpte-journal-article-nlm@v1"
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      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_49_2/MIJR15Vol49No2.xml)",
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        "updated": "2026-06-17T00:17:09.425Z",
        "version": "smpte-journal-issue-xml@v1"
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J17822.xml)",
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      "updated": "2026-05-22T21:44:19.125Z",
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      "active": true,
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        "confidence": "medium",
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    "volume": "49",
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