A Manual of Photographic Technique; Describing Apparatus, Materials, and the Details of Procedure

A Manual of Photographic Technique; Describing Apparatus, Materials, and the Details of Procedure

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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. 1921 edition. Excerpt: ...clearest shadows is really due to photographic action and not to light fog or chemical fog produced by prolonged development or use of too warm a developing solution. In the high lights or densest parts there should be a slight variation of density so that detail and texture in the lights may be preserved. If the rules or methods of procedure given in Chapters VI to IX are followed carefully there should be no difficulty in getting negatives of good printing quality, that do not exhibit excessive density at one end of the scale or clear glass at the other. In special cases greater contrast than usual may be desirable and is readily obtained by prolonging-development a little, say from 4 mins. to 5 or 6 mins. If soft negatives full of detail are required, then a diluted developer may be used with a corresponding increase in the time of development, but not a sufficient increase to obtain the same contrast as with normal time and normal strength of solution. The beginner is advised to keep strictly to the standard conditions until facility, judgment and confidence have been acquired by practice. Miscellaneous Defects. Besides the defects in quality of image due to bad focusing (want of definition), and bad exposure or development (incorrect tone values), there are other more or less accidental defects which the beginner should learn to recognize. For instance, the result of imperfect fixation may be either whitish patches on the back of the film or reddish-brown stains according to whether the inimersion in the hypo was too short or the plate not washed enough as well as not fixed enough. Hosts of minute White specks on the negative are due to dust on the plate during exposure and if these spots show one edge black and the other with a...show more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236801148
  • 9781236801142