Kodak Telek: They are attached over the Camera lens to permit truly close-up pictures with ordinary hand cameras. The more diopters, the closer the working distance and the greater the magnification.
The Kodak Telek Lenses 1—, 2 — , 3 — , and 4 — are negative lenses of 1, 2, 3, and 4 diopters, whose purpose is to increase the effective focal length of the Camera lens and give a telephoto effect.
The filters recommended for use with Kodak Films are the Kodak Sky Filter, Kodak Color Filter, and Wratten Kl, K2, G, and A Filters. There are other filters but they are intended for more or less technical and specific purposes and need not be mentioned here. They are described fully in these Eastman Kodak Company publications: "Filters—Kodak Data Book on Filters and Other Lens Accessories," "The Photography of Colored Objects," and "Wratten Light Filters," all available at Kodak dealers'.
The now obsolete "color blind" films were affected by rays of the spectrum from ultraviolet to the middle of the green. The familiar Kodak Verichrome Film is much more sensitive to the green rays and is also affected by yellow rays. Kodak Super-XX Panchromatic, Kodak Plus-X Panchromatic, and Kodak Panatomic-X are some of the films lhal respond to the ultraviolet and the whole of the visible spectrum. |
