The American annual of photography . FRIENDS. SAMUEL DORAN. 223 ACTINOMETER VERSUS GUESSING By G. W. ALLYN, EETING amateurs on my summer outings, I am astonished at their manner of making exposures. Most of them in a happy-go-lucky manner, snap-shot at everything in sight, with absohitely no regard for light, time or place; others more serious are seen struggling to apply a series of tables based upon the month, day and hour. A few, and only a few, are equipped with an actinometer,and employ what is the ony scientific method in timing expos-ures. There are several well-known factors whic
The American annual of photography . FRIENDS. SAMUEL DORAN. 223 ACTINOMETER VERSUS GUESSING By G. W. ALLYN, EETING amateurs on my summer outings, I am astonished at their manner of making exposures. Most of them in a happy-go-lucky manner, snap-shot at everything in sight, with absohitely no regard for light, time or place; others more serious are seen struggling to apply a series of tables based upon the month, day and hour. A few, and only a few, are equipped with an actinometer,and employ what is the ony scientific method in timing expos-ures. There are several well-known factors which determine theproper length of all exposures: the plate speed, the size of thediaphragm opening, the character of the subject and the of these factors are well understood and easily adjustedmechanically, but the light which is the dominant one and uponwhich everything depends, is most complicated. We know, and may notice, that the intensity of light variesconstantly from hour to hour and from minute to minute; butit is impossible for the human eye to know its quality. Of the colors into which the
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorktennantandw
