File:The American annual of photography (1922) (14595024899).jpg

Identifier: americanannualof36newy (find matches)
Title: The American annual of photography
Year: 1922 (1920s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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be unprovidedwith spring clips, so that the negative is loose. A very triflingshift of the negative will have a considerable efifect on thefocus. A displacement of the easel is not injurious to thesame extent, but even that may interfere with uniform sharp-ness. The easel may be untruly mounted or not properlylevel, especially if home-made, for, simple as it seems, toobtain (and retain) a really flat surface is not at all an easymatter. The performance of an altogether unexceptionableenlarger is often thrown quite out of true by a clumsily-constructed makeshift easel. An exception to-the foregoing rule of parallelism must, ofcourse, be made when it is desired to correct the slantingupright lines of an architectural negative, due to its havingbeen taken with the lens out of the horizontal, and with neglectto use the swing-back. In such circumstances, it is usuallypossible to get the lines right again by tilting the negativeand the easel, many of the more expensive enlarging outfits 174
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^T5 being furnished with adjustments for this purpose. Afterany occasion of using these, great care should always be takenthat the negative-holder and easel are again returned to theexact vertical—indeed, there ought properly to be someautomatic device to check them in that position, or to showat a glance that they are in it. Enlargements are frequently rendered uneven in sharpnessfrom the mere fact of the paper not remaining flat whenpinned up. A glass-fronted easel is, therefore, much the best.It should be seen that the glass is free from defects. If the easel has grooves cut at the base to run on inverted-Vrails, particular attention is needed that these grooves are trulyperpendicular to the easel when the latter is upright, otherwiseit will be given a sideways twist, a tilt forwards or backwards,or possibly both. Perhaps the fault may be so slight as toescape casual notice, and yet sufficient to affect the definitionin part of the enlargement. It is quite possible to shift the e

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