Voigtländers helmetallkamera
A conical brass camera for daguerreotypes, the first with a fast lens calculated for portraits.
The lens was calculated by the mathematician Joseph Petzval and let in far more light than earlier ones. The exposure time for a portrait fell from many minutes to under one.
Materials: Brass, glass optics
Manufacture: Made in Vienna.
The conical brass body on a stand.
The large lens at the front.