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ROSS'S PHOTOGRAPHIC PORTRAIT AND LANDSCAPE LENSES.--These lenses give
correct definition at the centre and margin of the picture, and have their
visual and chemical acting foci coincident.
_Great Exhibition Jurors' Reports_, p. 274.
"Mr. Ross prepares lenses for Portraiture having the greatest intensity
yet produced, by procuring the coincidence of the chemical actinic and
visual rays. The spherical aberration is also very carefully corrected,
both in the central and oblique pencils."
"Mr. Ross has exhibited the best Camera in the Exhibition. It is
furnished with a double achromatic object-lens, about three inches
aperture. There is no stop, the field is flat, and the image very
perfect up to the edge."
A. R. invites those interested in the art to inspect the large Photographs
of Vienna, produced by his Lenses and Apparatus.
Catalogues sent upon Application.