File:The American annual of photography (1917) (14597433917).jpg

Identifier: americanannualof1917newy (find matches)
Title: The American annual of photography
Year: 1917 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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de the point slightly beyondthe back of the metal. This will make an opening of about200 microns, etc. Any desired opening that one wishes tomake can be made in this manner. It is however advisablenot to go beyond an opening of 600 microns, due to the lossof definition even for the softness of the photograph. Open-ings should be made upon pieces of metal which are large 32 enough to fit over the opening of the lens board after thelenses have been removed. Having pierced the metal disks with the desired openings,let us turn our attention to the camera. The box type can beused as v^ell as the folding type, and those w^ishing to constructtheir own camera may do so. It is sufficient to say, as spacedoes not permit me to go into the detail of the construction ofthe camera, that there are many books and pamphlets on themarket pertaining to the subject. The folding type has itsadvantage over the box type in so far as the size of the ob-jects to be photographed is concerned. Another advantage
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CHURCH OF OUR FATHER. Figure 4. is, its different sizes can be seen on the ground-glass. Thenagain, the further opening is moved away from the plate thesmaller the objects, and vice versa, the nearer the opening, thelarger the objects. The box type or home-made type will takephotographs just as well, distinct and soft as the folding type.Only one size of the object is however obtained with this typeof camera owing to the stationary plate-holder. The exposure of the photograph is mainly based upon the 33 distance at which the opening is removed from the plate, forinstance if the opening be removed from the plate three inches,an exposure of from three to three and one-half minutes willsuffice on a bright day. One minute to one and one tenthminute additional exposure of the plate is required for eachinch that the opening is moved from the plate. Refer to theend of article for table governing the time for exposures ofmaximum and minimum distances from opening to plate andto size of the ph

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