Date: | 03 02 1934 |
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Description: | A man exposing a negative onto a zinc plate, in preparation for making a zinc etching at Wisconsin Engraving Co., 109 S. Carroll Street. |
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Description: | Sid's illustration showing the range of infrared and ultraviolet radiation and the color sensitivity of Panchromatic and Ortho films compared to human visi... |
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Description: | Sid's illustration showing the relationship between film, a camera lens and the light controls for aperture and shutter speed in photography. |
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