. The book of photography; practical, theoretical and applied. thochromatic Photography. It isstrongly advised that the plates bebacked, otherwise the fine details of tree-tops, etc., against the sky are likely to belost or detracted from by halation, causedby oblique reflection of light from theback of the plate. With celluloid filmshalation is largely avoided, and withpaper films entirely disappears. The phe-nomenon of halation and the variousmethods of avoiding it are referred towith greater detail in the section on Archi-tectural Photography. Other things beingequal, there is less chance o
. The book of photography; practical, theoretical and applied. thochromatic Photography. It isstrongly advised that the plates bebacked, otherwise the fine details of tree-tops, etc., against the sky are likely to belost or detracted from by halation, causedby oblique reflection of light from theback of the plate. With celluloid filmshalation is largely avoided, and withpaper films entirely disappears. The phe-nomenon of halation and the variousmethods of avoiding it are referred towith greater detail in the section on Archi-tectural Photography. Other things beingequal, there is less chance of halationoccurring with thicklj coated plates thanwith those which are thinly coated. 494 THE BOOK OF PHOTOGRAPHY. Selection of Lens. For pictorial work the single landscapelens has much in its favour; its narrow-ness of angle, length of focus, and absenceof biting definition being all good back combination of a doublet lens,such as a rapid rectilinear, is similar in itsproperties, and may be used in the samemanner. For some subjects, the pinhole. Fig. 634.—The Paragon Focussek. is peculiarly suitable, allowing a widechoice as to focal length and angle ofview. It is probable, however, that theaverage worker will prefer a lens whichwill permit him to obtain the maximumof sharpness when desired, and for tech-nical or commercial landscape photo-graphy this is practically this case, the purchase of a good rapidrectilinear or an anastigmat is greater rapidity of the rectilinearand anastigmat types of lenses must not
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