Photo-Micrographs And How to Make Them
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To quickly assess the difficulty of the text, read a short excerpt:
125.
THE LIGHT. 39 technical difficulties which have not been solved in a satisfactory manner.
Photo-micrographs of the surfaces of opaque objects, of insects, foraminifera, etc., would be ex- ceedingly interesting, and useful for illustrating scientific treatises, popular lectures, etc.
It is well known, in ordinary photography, that objects in different planes can only be brought into focus at the same time in a greatly reduced picture. In a life-size photograph of a man, for example, when th...e nose is in perfect focus, the ears will be out of focus, indistinct and distorted.
This difficulty is overcome by making a reduced picture in the first instance, and then enlarging this to any extent desired. Minute objects present irregularities of form and of surface as great, rela- tively, as larger ones, and the difficulty referred to is magnified in proportion as we magnify the object.
The quality required of a lens which is best adapted to overcome this difficulty is called pene- trating power.
What to read after Photo-Micrographs And How to Make Them?
You can find similar books in the "Read Also" column, or choose other free books by George Miller Sternberg to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
125.
THE LIGHT. 39 technical difficulties which have not been solved in a satisfactory manner.
Photo-micrographs of the surfaces of opaque objects, of insects, foraminifera, etc., would be ex- ceedingly interesting, and useful for illustrating scientific treatises, popular lectures, etc.
It is well known, in ordinary photography, that objects in different planes can only be brought into focus at the same time in a greatly reduced picture. In a life-size photograph of a man, for example, when th...e nose is in perfect focus, the ears will be out of focus, indistinct and distorted.
This difficulty is overcome by making a reduced picture in the first instance, and then enlarging this to any extent desired. Minute objects present irregularities of form and of surface as great, rela- tively, as larger ones, and the difficulty referred to is magnified in proportion as we magnify the object.
The quality required of a lens which is best adapted to overcome this difficulty is called pene- trating power.
What to read after Photo-Micrographs And How to Make Them?
You can find similar books in the "Read Also" column, or choose other free books by George Miller Sternberg to read onlineMoreLess
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