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A.T. Thompson & Co. Importers Boston brass Petzval lens
A.T. Thompson & Co. Importers Boston brass Petzval lens
A.T. Thompson & Co. Importers Boston brass Petzval lens
A.T. Thompson & Co. Importers Boston brass Petzval lens
A.T. Thompson & Co. Importers Boston brass Petzval lens
A.T. Thompson & Co. Importers Boston brass Petzval lens

A.T. Thompson & Co. Importers Boston brass Petzval lens

$ 147.84

Availability: 100 in stock
  • All returns accepted: ReturnsNotAccepted
  • Model: 10 x 10
  • Type: Large Format View Camera
  • Color: Brass
  • Brand: Thompson
  • Country/Region of Manufacture: United States

    Description

    Antique A.T.THOMPSON & CO. IMPORTERS BOSTON Brass Magic Lantern Petzval lens, circa 1800's.
    will need dissembling and lots of cleaning as can be expected
    Some info on this lens according to web searching, was that it was made in Boston at 26 Bromfield St. Boston, Mass, and that it is a Petzval lens. The Petzval lens was developed in 1840 by Joseph Petzval . It consisted of two doublet lenses with an aperture stop in between. The front lens is well corrected for spherical aberrations but introduces coma . The second doublet corrects for this and the position of the stop corrects most of the astigmatism . However, this results in additional field curvature and vignetting . The total field of view is therefore restricted to about 30 degrees. An f-number of f /3.7 was achievable, which was considerably faster than other lenses of the time.The speed of the lens is ideal for portrait photography since the exposure time could be reduced.