![]() A lens of large aperture must therefore be employed in portraiture, so long as photographic processes remain in their present state of insensitiveness. In taking a portrait it is evident that the time of exposure should be reduced as much as possible, because after remaining in a constrained position for a long time the features of the sitter betray an expression of the discomfort felt. The object of this instrument is to obtain an image well defined in its principal parts, when a large volume of light is admitted. ![]() From A Dictionary of Photography By Thomas Sutton, John Worden 1858 (London):
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