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Books Books 1 - 1 of 1 on definition at the margins—that the depth of focus is limited, which gives enlargement....
" definition at the margins—that the depth of focus is limited, which gives enlargement and distortion to all projections, and that the size of the picture is small. Now on placing a diaphragm of three inches aperture between the combinations, the "
A manual of photographic manipulation - Page 63
by Lake Price - 1868
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Wilson's Photographics: A Series of Lessons, Accompanied by Notes, on All ...

Edward Livingston Wilson - EDUCATION - 1881 - 336 pages
...and a half inches; it will be observed that in this condition the field is curved—which gives bad definition at the margins—that the depth of focus...three inches aperture between the combinations, the result is represented by the dotted lines BB ; it is then seen that the field is extended and depth...
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