{
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"docId": "10.5594-J13063",
"document": {
"abbrevTitle": "J SMPE",
"abbrevTitle$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"abstract": "The photo-chemical action of light on the photographic plate depends on the light intensity and on the length of exposure, other conditions being constant. The brightness of the photographic image is proportional to the square of the ratio of the radius of the entrance pupil to the focal distance, or to the square of the relative aperture, which latter may be expressed by 1/n, where n = f/d (d is the diameter of the entrance pupil). The illumination afforded by a photographic objective is determined by its relative aperture, on purely geometric considerations. In this expression of the relative aperture, there is no factor expressing the light losses in the lens which decrease the effective illumination of objectives; for example, the losses caused by reflection at the lens surfaces, by absorption in the glass, and by absorption in the cementing material. If we designate by I0 and I the intensities of illumination before and after passing through the objective, the true, effective brightness of a photographic objective is more accurately given by the expression.",
"abstract$meta": {
"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/07302015 IBP DEPOSITS/Journal-256-Issues/smptej_14_5/MIJR15Vol14No5.xml)",
"source": "parsed",
"updated": "2026-06-16T18:14:32.753Z",
"version": "smpte-journal-issue-xml@v1"
},
"articleType": "research-article",
"articleType$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"authors": [
"J. Hrdlicka"
],
"authors$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"copyright": {
"holder": "Society of Motion Picture and Television Engineers, Inc.",
"holder$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"year": "1930",
"year$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
}
},
"copyright$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"docId": "10.5594-J13063",
"docId$meta": {
"confidence": "high",
"note": "Derived from DOI 10.5594/J13063",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"docLabel": "Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 5, May 1930)",
"docLabel$meta": {
"confidence": "medium",
"note": "Composed from venue title, volume/issue and date",
"source": "inferred",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"docTitle": "Measuring the Effective Illumination of Photographic Objectives",
"docTitle$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"docType": "Journal Article",
"docType$meta": {
"confidence": "high",
"note": "NLM — SMPTE journal paper",
"source": "inferred",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"doi": "10.5594/J13063",
"doi$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"href": "https://doi.org/10.5594/J13063",
"href$meta": {
"confidence": "high",
"note": "Constructed from DOI 10.5594/J13063",
"source": "inferred",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"issn": {
"print": "0097-5834",
"print$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
}
},
"issn$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"journalAcronym": "MIJR",
"journalAcronym$meta": {
"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/07302015 IBP DEPOSITS/Journal-256-Issues/smptej_14_5/MIJR15Vol14No5.xml)",
"source": "parsed",
"updated": "2026-06-16T18:14:32.753Z",
"version": "smpte-journal-issue-xml@v1"
},
"number": "5",
"number$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"pages": "531–533",
"pages$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"publicationDate": "1930-05-01",
"publicationDate$meta": {
"confidence": "high",
"note": "Day absent in NLM source — padded to 01",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"publisher": "SMPTE",
"publisher$meta": {
"confidence": "high",
"note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
"source": "inferred",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"publisherLocation": {
"city": "White Plains, NY",
"city$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
},
"country": "USA",
"country$meta": {
"confidence": "high",
"note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/07302015 IBP DEPOSITS/Journal-256-Issues/smptej_14_5/MIJR15Vol14No5.xml)",
"source": "parsed",
"updated": "2026-06-16T18:14:32.753Z",
"version": "smpte-journal-issue-xml@v1"
}
},
"publisherLocation$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
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"status": {
"active": true,
"active$meta": {
"confidence": "medium",
"note": "No explicit status in NLM source — journal papers default active",
"source": "inferred",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
}
},
"volume": "14",
"volume$meta": {
"confidence": "high",
"note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13063.xml)",
"source": "parsed",
"updated": "2026-05-22T20:40:11.684Z",
"version": "smpte-journal-article-nlm@v1"
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