Marion and Co., compiler · London : Marion and Co. · leaf 80
CAL GUIDE TO PHOTOGRAPHY. gether at a point on the wall, but spread over a disc a little larger than the hole in the shutter. If we make the hole very small, so as to get sharp definitions, we let through so little light that the image is scarcely visible at all. What we want in this case is a… … The lens which we show here is the simplest possible, and- is one which, although by its means photographs of a kind might be taken, yet is not by any means a very perfect instrument. Still, however complicated a photo- graphic lens may be, its sole object is to produce the
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