Objective Lens


This is a 5-inch aperture objective lens. The “J.W. Fecker / Pittsburgh / 1939 / Apochromat 180o Focus / Correct in Cell” inscription refers to James Walter Fecker, the optical instrument maker in Pittsburgh who made this example for the U.S. Naval Observatory. An apochromat is a lens with minimal chromatic or spherical aberration. Ernst Abbe, Research Director of the Zeiss Optical Works in Jena, introduced the term in the 1880s, in reference to his microscope objectives made with the new Schott optical glass.

Date Made: 1939

Maker: Fecker, James Walter

Location: Currently not on view

Place Made: United States: Pennsylvania, Pittsburgh

Subject: Science & Scientific Instruments


See more items in: Medicine and Science: Physical Sciences


Exhibition Location:

Credit Line: U.S. Naval Observatory

Data Source: National Museum of American History

Id Number: 2005.0172.05Catalog Number: 2005.0172.05Accession Number: 2005.0172

Object Name: 5 inch apochromatic lens in brass cell

Measurements: overall: 2 1/2 in x 7 in x 7 in; 6.35 cm x 17.78 cm x 17.78 cmoverall: 2 7/8 in x 7 1/8 in x 7 1/8 in; 7.3025 cm x 18.0975 cm x 18.0975 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ab-b8d6-704b-e053-15f76fa0b4fa

Record Id: nmah_1293530

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