LONG FOCUS PREMO

Rochester Optical Company, Rochester, New York 1895-1904

4X5 equipped with Bausch & Lomb's Iris Diaphragm Shutter, only offered in 1901

Bausch & Lomb Iris Diaphragm Shutter with Zeiss Convertible Anastigmat Lens

Patent No. 558,039 was granted to William F. Carlton and Harvey W. Locke on April 14, 1896. The patent's extended bellows design provided for greater range and capability:

Source: U.S. Patent and Trademark Office

Source: U.S. Patent and Trademark Office

5X7 example equipped with the first model of the Victor Shutter, offered only in 1896

Victor Shutter, first model, 1896

5X7 4X5

5X7 4X5

5X7 4X5