The American annual of photography . KNAFFL & BRAKEBILL. 133 appropriation this year for soft-focus prints of their this money will go to an amateur because most of theprofessionals do not use soft-focus lenses. The pinhole woulddo the work as well as the soft-focus lens. Many a fine resi-dence also would make a more attractive view if made with apinhole instead of with a lens. I Some workers have tried to use the pinhole and found thfematter of exposure a stumbling block as there was, up to a few. Figure i. years ago, no definite formula by which one could calculatequickly and acc
The American annual of photography . KNAFFL & BRAKEBILL. 133 appropriation this year for soft-focus prints of their this money will go to an amateur because most of theprofessionals do not use soft-focus lenses. The pinhole woulddo the work as well as the soft-focus lens. Many a fine resi-dence also would make a more attractive view if made with apinhole instead of with a lens. I Some workers have tried to use the pinhole and found thfematter of exposure a stumbling block as there was, up to a few. Figure i. years ago, no definite formula by which one could calculatequickly and accurately the necessary exposure under any andall conditions of light, subject, and pinhole. Dr. H. DArcyPowers, an ardent and scientific experimenter, finally dis-covered a definite relation between the lens and pinhole, andfrom this he evolved a formula by which pinhole exposurescan be calculated with all the accuracy of lens exposures. Hehas adopted a series of holes of definite sizes which are num- 134
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1919
