"Petzval lens" meaning in All languages combined

{
  "etymology_text": "Developed in 1840 by Joseph Petzval.",
  "forms": [
    {
      "form": "Petzval lenses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Petzval lens (plural Petzval lenses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Photography",
          "orig": "en:Photography",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A photographic lens consisting of two doublet lenses with an aperture stop in between."
      ],
      "id": "en-Petzval_lens-en-noun-wpGRkIYH",
      "links": [
        [
          "photographic",
          "photographic"
        ],
        [
          "lens",
          "lens"
        ]
      ],
      "raw_glosses": [
        "(historical) A photographic lens consisting of two doublet lenses with an aperture stop in between."
      ],
      "related": [
        {
          "word": "Petzval condition"
        },
        {
          "word": "Petzval sum"
        }
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "Petzval lens"
}

{
  "etymology_text": "Developed in 1840 by Joseph Petzval.",
  "forms": [
    {
      "form": "Petzval lenses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Petzval lens (plural Petzval lenses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Petzval condition"
    },
    {
      "word": "Petzval sum"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Photography"
      ],
      "glosses": [
        "A photographic lens consisting of two doublet lenses with an aperture stop in between."
      ],
      "links": [
        [
          "photographic",
          "photographic"
        ],
        [
          "lens",
          "lens"
        ]
      ],
      "raw_glosses": [
        "(historical) A photographic lens consisting of two doublet lenses with an aperture stop in between."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "Petzval lens"
}