Marion and Co., compiler · London : Marion and Co. · leaf 92
84 PRACTICAL GUIDE TO PHOTOGRAPHY. short as possible. Rapidity has certainly been gained. The largest apertures of portrait lenses vary from - in / the ordinary portrait lens to ^in the extra rapid portrait lens. It is thus from four to ten times as rapid as the … rapid landscape lenses. At the same time that rapidity has been gained the qualities which are required in a lens to be used for portraiture only have not been sacrificed. The definition given through a very narrow angle is exquisite, and the field is fairly flat. The great difficulty in the…
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