A manual of photographic chemistry, theoretical and practical . Fig. 30. out, and this can be effected by means of the diaphragms before alluded to in the paragraph on spherical aberration; theposition and use of which will be shown in the following of Focus for J^ear and Distant Objects.—Lenses employed with the full aperture, do not render near andremote objects sharp upon the ground glass of the camera atthe same time. If the foreground is in focus, the lens must bethrown inwards to make the distance clear, and vice versa.

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Keywords: ., bookcentury1800, bookdecade1880, bookidma, booksubjectphotography