TO PHOTOGRAPHERS.—Pure Chemicals, with every requisite for the practice of Photography, according to the instructions of Hunt, Le Gray, Brébisson, &c. &c., may be obtained of WILLIAM BOLTON, Manufacturer of pure chemicals for Photographic and other purposes.
Lists of Prices to be had on application.
146. Holborn Bars.
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."
Catalogue sent upon Application.
A. ROSS, 2. Featherstone Buildings, High Holborn.