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    "abbrevTitle": "SMPTE Mot. Imag J.",
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      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/06042015 PROGRAMMATICALLY CONVERTED SAMPLES/Journals/smptej_5_13/MIJR15Vol5No13.xml)",
      "source": "parsed",
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    "abstract": "The term “Point Light Source” is frequently made use of in the calculation and discussion of optical matters. It should always be kept in mind, however, that such a source is only hypothetical and represents a theoretical limit that is unattainable by any means whatever. In a quite similar manner, textbooks on optics give explanations and even formulae for calculating lenses on the basis of a lens with infinitesimal or zero thickness. These theoretical concepts are, of course, of considerable value in working out an optical system, and their use for such purposes should not be decried. In fact, some such assumptions are almost a necessity for the practical development of applied optics, but the fact remains that they are only hypothetical assumptions which can never be realized, and allowance must always be made for the finite or actual dimensions of the real physical light source. The astronomical telescope may perhaps be an exception, for the fixed stars as seen from the earth are point light sources for all but the most extremely delicate apparatus. In the observation of stars, however, another difficulty is encountered, i. e., the image of the star is not a point but has quite appreciable dimensions due to diffraction.",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "authors": [
      "C. A. B. Halvorson",
      "S. C. Rogers"
    ],
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "copyright": {
      "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_J12473.xml)",
        "source": "parsed",
        "updated": "2026-05-22T20:40:11.684Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "year": "1921",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
        "source": "parsed",
        "updated": "2026-05-22T20:40:11.684Z",
        "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_J12473.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docId": "10.5594-J12473",
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    "docLabel": "Transactions of the Society of Motion Picture Engineers ( Volume: 5, Issue: 13, 1921)",
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      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docTitle": "A Point Light Source for Laboratory Use",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docType": "Journal Article",
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      "note": "NLM <article> — SMPTE journal paper",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "doi": "10.5594/J12473",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
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    "href": "https://doi.org/10.5594/J12473",
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      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J12473",
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    "issn": {
      "print": "0096-6460",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
        "source": "parsed",
        "updated": "2026-05-22T20:40:11.684Z",
        "version": "smpte-journal-article-nlm@v1"
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    "issn$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/06042015 PROGRAMMATICALLY CONVERTED SAMPLES/Journals/smptej_5_13/MIJR15Vol5No13.xml)",
      "source": "parsed",
      "updated": "2026-06-16T18:14:32.753Z",
      "version": "smpte-journal-issue-xml@v1"
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    "number": "13",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "pages": "48–54",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J12473.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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      "updated": "2026-05-22T20:40:11.684Z",
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      "confidence": "high",
      "note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
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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_J12473.xml)",
        "source": "parsed",
        "updated": "2026-05-22T20:40:11.684Z",
        "version": "smpte-journal-article-nlm@v1"
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      "country": "USA",
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        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/06042015 PROGRAMMATICALLY CONVERTED SAMPLES/Journals/smptej_5_13/MIJR15Vol5No13.xml)",
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        "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_J12473.xml)",
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        "confidence": "medium",
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        "updated": "2026-05-22T20:40:11.684Z",
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    "volume": "5",
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