The New Photo-Miniature Volume 8, Nos. 85-96

The New Photo-Miniature Volume 8, Nos. 85-96

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...are very black, and sharply defined, it is a sign of clearness; grey shadows. on the other hand, indicate the presence of mist in the air. Some workers advocate reducing the theoretical exposures for distant subjects on account of the almost certain presence of mist in the air. This sort of thing is purely a matter of personal fancy upon which no reliance can be placed. In tele photography the exposures can be made by rule with the same success as in other branches of work. R. A word as to rapid exposures. The apid.. Exposures comparative slowness of an ordinary telephoto lens leads many to suppose that it can be used only for long exposures: and that rapid work cannot be done with it. This is an error. High-speed telephotography is in process of development. Marriage has photographed a train in motion at the rate.of twenty miles an hour, the equivalent aperture ' of the telephoto lens being f/i2.6, the exposure with a focal-plane shutter being $5 of a second, time and date being four o'clock in April. The sun was in such a position that the train was in shadow. A stand-camera was used and the lens focused on the spot selected for the locomotive. This, it is true, is not very high-speed work, but it is sufliciently fast to show that the lens can be used for ordinary hand-camera photography. An aperture of f/12.6 means that a positive lens of f/4 approximately, was used, and that a magnification of three times was obtained. In this we are approaching the maximum of telephotographic rapidity--the lens, like all other lenses, having a limit of effective working aperture. For ordinary hand-camera work a low magnification, say three diameters, will be suitable on most subjects; with a positive of f/4.5 or f/6, exposure of 1%; of a more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • United States
  • English
  • black & white illustrations
  • 1236744985
  • 9781236744982