We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
HOME MOVIES FOR JULY
lOOM shots, in which the camera seems to move swiftly and continuously from a long or medium shot to a closeup, are an interesting cinematic effect seen today in many theatrical motion pictures. A more or less recent film in which zoom shots were employed is "Edge of Darkness," which starred Errol Flynn and Ann Sheridan. Readers who saw this picture may recall one particularly outstanding zoom shot in which the camera focused from a great height upon a village square, then suddenly moved down close and centered unon a group of townspeople gathered about the church.
Only the cinematic minded, of course, would ponder the execution of this camera effect. How was it accomplished? Certainly not by moving in with the camera, for the camera was at great height at beginning of the shot, and no camera crane yet devised can travel with the swiftness necessary to effect such a shot; nor would it be possible to manually manipulate the lens fast enough to keep the scene sharply focused during the great forward travel of the camera.
Such effects are accomplished through use of a special zoom lens which, by relatively simple manipulation, changes focal length and brings an object progressively closer to view on the screen.
• Continued on Page 290
• Fig. I — A loom lens gradually brings the object of interest in a scene up close on the screen, same as would be accomplished with a dolly shot, except that camera remains stationary and looming is accomplished by adjusting lens. Camera appears to move forward from full scene to the closeup indicated by dotted lines in center of picture.
• Fig. 2 — A 16mm. camera zoom lens which was available in Germany before the war, and will be made in America, according to reports. It has an aperture of f/2.8, unusually high for a zoom lens. Dotted lines show slots which alter separation between the elements as operator rotates the barrel, changing focal length from 26mm. to 79mm. (roughly I" to V/4").
• Fig. 3 — A: One type of zoom lens uses a concave element moving back and forth between two convex elements. The powers of the lens are so arranged that when the convex lens is at the front, it more than cancels out the front lens and when at the back, it cancels out the power of the rear element. B: A further variation is to move a plus lens back and forth between two minus, or concave, lenses. Here again the middle element is strong enough to cancel out the element which it approaches.
C: Upper sketch shows normal Galilean telescope before the lens, magnifying the image; lower sketch shows telescope in reverse, diminishing the image. The systems shown in A and B give effectively these two results, as the middle element is moved.
D: The other type of zoom lens, using the telescope of variable magnification. The regular camera lens completes the optical system.
285