Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . rther tree upon the ground-glass will be ^^^^ feet, or 2 inches. In this case,the relative height of the two trees is as 3 to 2. It may not be uninteresting to observehow this proportion will stand, supposing that we substitute a lens of half the focallength of the former, and bring up the size of the image of the nearer tree to 3 inches,by moving the lens to F, one-half the distance from it. The nearer tree is now but 100 feet off, but our unit being reduced fr
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . rther tree upon the ground-glass will be ^^^^ feet, or 2 inches. In this case,the relative height of the two trees is as 3 to 2. It may not be uninteresting to observehow this proportion will stand, supposing that we substitute a lens of half the focallength of the former, and bring up the size of the image of the nearer tree to 3 inches,by moving the lens to F, one-half the distance from it. The nearer tree is now but 100 feet off, but our unit being reduced from 1 to i, thescale will therefore be the height of the first tree ^o^^, or 3 inches, as before. Thesecond tree is now 200 feet off, its scale will be ^lo, and its height or U perspective heights of the two trees, therefore, as given by the smaller lens, in placeof being as 3 to 2 as in the case of the larger focus lens, will be as 2 to 1. These resultsagree approximately with those given in Fig. 197, although that figure was not drawnfor such a purpose ; it still, however, illustrates pretty well these OUTDOOR OPERATIONS. 199 stand the principles of art but the photographers methods of producing thetechnical excellences of his work should also be understood. Otherwise thecritic can have no feeling for his work, and without feeling one may as wellget out of focus—diffuse—at once. And, finally, since outdoor operations give the camera worker a wider field,so do they give him larger opportunities for the exercise of art may be lovely and beautiful, but to work amid the loveliness and beautyof nature, is a privilege above all which photography affords. Let it be meas-ured from a lofty standpoint and treated accordingly. Briefly, then, we conclude that all lenses (setting aside such imperfections as belongto their construction) will, when placed at the station-point, give pictures varying onlyin scale. But that when the same scene is
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