File:The American annual of photography (1917) (14760949216).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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opped to F:8 will give the same depthas on F :6.8 lens of 6 inch focus at the same stop, try it out andbe able to tell any one why both lenses will give the samedepth of field. Again, when you hear the statement that ananastigmat lens is faster at F :8 than a rapid rectilinear at thesame stop, find out for yourself whether it is true or not.When you discover that the anastigmat is not faster, knowivhy it is not. Remember, whatever accurate lens information you gathershould be applied to your work and not written up in a notebook where you will never be able to reach it when you needit the most. Formulae can be briefly condensed in a vestpocket diary and carried with you. As a matter of fact, theaverage photographer requires only about ten formulae tocarry him safely over any obstacle he may encounter. In allyour work make technical data subservient to results. By that is meant the avoidance of a plunge into technicali-ties with a result similar to that in the old story where it was 26
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DOGWOOD. ALICE BOUGHTON. said that the operation was successful but the patient died!There are many problems that work out beautifully by meansof X and y which cannot meet the test of practical application.Theory is to be valued, but good common sense combinedwith practical theory is the most serviceable combination forthe average photographer. In conclusion let me add that one of the most helpfulmethods of making an early acquaintance with your new 27 anastigmat is a thoroughly digested reading of all descriptivematter relating to your lens. After which a rough test, suchas outlined in the first few paragraphs, will pave the way to aclear realization of the limitations and the advantages of yourown anastigmat lens. This is a repetition and intended assuch. It cannot be too strongly emphasized that accuratelyassimilated lens facts constitute eighty per cent of lens success.Also, the way may be pointed out, but each owner of a newanastigmat must become a law unto himself. The masteryof

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