THE OCULAR PORTRAIT
LENS
The
Scientific Lens Company, New York
1904-1906
The
Ocular Portrait Lens incorporated a unique focal length adjusting
feature on exposure, not found on other lenses of the time. The concept appears
to be the brainchild of Ferdinand Stark of New York, with other patented
enhancements by Ulrich Nehring that were assigned to
the Scientific Lens Company. Nehring reportly acquired the
Scientific Lens Company around 1900, but had already been selling lenses,
starting in the late 1890's under his own name.
He reportedly published a lens catalog in 1900 and continued to sell
under various names until about 1910.
This ability to change the focal length was a
purpose-built feature versus an inter-lens shutter improvement like the Benster Diaphragm, which was a factory modification to an
existing lens. The Ocular was designed
to expand and contract the distance between the front and rear elements on
exposure, thereby changing the focal length to increase depth of field. It was
also capable of being used without the focal change option. Introduced in 1904 and produced through at
least 1906, the Ocular represented the pinnacle in last attempts to bring
innovation to conventional portrait lenses of the day.
Advertisement
for the "Ocular" and the Coursen Shutter
from Camera Craft monthly for July, 1904