The Photo-Miniature Volume . 3, 25-30

The Photo-Miniature Volume . 3, 25-30

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ...objects shall be reasonably sharp? If an object half-way be chosen, we know that as the aperture is diminished the distant objects will become more sharply defined than those near to the lens, and with the diminishing aperture the more difficult it is to estimate the degree of definition obtained. The plan of holding a lighted candle or match in proximity to, alternately, a near and a distant portion of the building is very well in its way, but cannot always be adopted and is sometimes misleading when it can. A better plan is the following: After the general scheme has been arranged, and while the largest available aperture is in use, measure backward from the nearest plane one-third of the distance toward the most distant plane, and focus sharply upon a central object in the plane so determined. There should be no great difficulty in focusing even in a comparatively dark interior, if fiS is used. The aperture may then be diminished until either the question of exposure forbids the use of a smaller stop or the foreground objects are critically sharp. In either case the foreground and distance will be equally defined. Although the rule, like many other useful optical rules, is not theoretically correct, the deviation from theoretical exactitude is so slight as to be quite negligible, and entails no elaborate calculation in its application. A foot rule is all that is necessary, and even that may be dispensed with at a pinch, and some more crude form of measurement adopted. Actien-Gesellschaft fur Anilin-Fabrication, Berlin 8. 0. Photographlo Department Manufacturers of the patent Developers: Eikonogen FikfinflffPn produces - negative of ample denuwiiHuggii gityt fulof dgtail nd gradation, but with a peculiarly artistic and toft effect, more

Product details

  • Paperback | 124 pages
  • 189 x 246 x 7mm | 236g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236532783
  • 9781236532787