. The book of photography; practical, theoretical and applied. gth must bechosen with due regard to the size ofthe building for which it is used. Thenave of a cathedral, for example, wouldrequire a long focus lens, otherwise itsdistant choir and east window would be reduced to an absurd degree. But onthe other hand, if it is intended to securea bit of architectural detail in such aposition that the camera must be close toit, the long focus lens would be quite use-less, and must be replaced by one ofwide angle. A lens of the portable sym-metrical type is the best kind to employfor this purpose.
. The book of photography; practical, theoretical and applied. gth must bechosen with due regard to the size ofthe building for which it is used. Thenave of a cathedral, for example, wouldrequire a long focus lens, otherwise itsdistant choir and east window would be reduced to an absurd degree. But onthe other hand, if it is intended to securea bit of architectural detail in such aposition that the camera must be close toit, the long focus lens would be quite use-less, and must be replaced by one ofwide angle. A lens of the portable sym-metrical type is the best kind to employfor this purpose. It has splendid covex-ing power, and gives exquisite definition,but will recfuire to be stopped down, andnecessitates a liberal exposure. Its use isalways indicated in cramped situations,whether they be inside a building oroutside. The Voigtlander Wide-AngleEuryscope (Fig. 756) may be here men-tioned as admirably adapted for mostclasses of architectural work. It, ofcourse, goes without saying that, whereexpense is no object, an anastigmat is tobe ill Fig. 75G.—Voigtlandeks Wiue-Angle Euryscope. Long v. Short Focus Lenses. When only a portion of architecturaldetail is required and one is not obligedto get close to the subject, the long focuslens would certainly be preferable. Thegeneral rule is to use as long a focus lensas possible, resorting only to the wideangle when the subject includes a greatdeal and the camera cannot be placedsufficiently far away. It is generallyacknowledged that the perspective is bestwhen the focal length of the lens usedis about equal to the diagonal of theplate. It must be remembered that wher-ever long or short focus lenses are re-ferred to it is their proportion to thediagonal of plate which is meant. Theapparent distortion arising from the useof a short focus lens exists only in the 554 THE BOOK OF PHOTOGRAPHY. margins or outer portions of the picture,although the perspective of the centreportion may be spoilt by contrast withthe su
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